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0, 1, 3, 6, 2, 7, 13, 20, 12, 21, 11, 22, 10, 23, 9, 24, 8, 25, 43, 62, ... "subtract if possible, otherwise add": a(0) = 0; for n > 0, a(n) = a(n − 1) − n if that number is positive and not already in the sequence, otherwise a(n) = a(n − 1) + n, whether or not that number is already in the sequence. A005132: Look-and-say sequence
The following outline is provided as an overview of and topical guide to the September 11 attacks and their consequences: September 11 attacks – four coordinated suicide attacks upon the United States in New York City and the Washington, D.C., area on September 11, 2001.
The North Tower (WTC 1) was the first building to be hit when American Airlines Flight 11 crashed into it at 8:46 a.m., [a] causing it to collapse at 10:28 [e] after burning for one hour and 42 minutes. [f] At 9:03 a.m., [g] the South Tower (WTC 2) was struck by United Airlines Flight 175; it collapsed at 9:59 a.m. [h] after burning for 56 minutes.
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The Uniformed Firefighters Association of Greater New York also reported over 170 deaths of firefighters due to 9/11-related illnesses, and that roughly 1 in 8 firefighters who were at Ground Zero have developed cancer. [247] At least 221 policemen have died in the years since 2001 from illnesses related to the attacks in New York City. [248]
A bijection with the sums to n is to replace 1 with 0 and 2 with 11. The number of binary strings of length n without an even number of consecutive 0 s or 1 s is 2F n. For example, out of the 16 binary strings of length 4, there are 2F 4 = 6 without an even number of consecutive 0 s or 1 s—they are 0001, 0111, 0101, 1000, 1010, 1110. There is ...
Landsberg and Manivel extended the definition of E n for integer n to include the case n = 7 + 1 ⁄ 2.They did this in order to fill the "hole" in dimension formulae for representations of the E n series which was observed by Cvitanovic, Deligne, Cohen and de Man. E 7 + 1 ⁄ 2 has dimension 190, but is not a simple Lie algebra: it contains a 57 dimensional Heisenberg algebra as its nilradical.
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