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2. Double factorial - Wikipedia

   en.wikipedia.org/wiki/Double_factorial

   These are counted by the double factorial 15 = (6 − 1)‼. In mathematics, the double factorial of a number n, denoted by n‼, is the product of all the positive integers up to n that have the same parity (odd or even) as n. [1] That is,

3. Stirling permutation - Wikipedia

   en.wikipedia.org/wiki/Stirling_permutation

   In combinatorial mathematics, a Stirling permutation of order k is a permutation of the multiset 1, 1, 2, 2, ..., k, k (with two copies of each value from 1 to k) with the additional property that, for each value i appearing in the permutation, any values between the two copies of i are larger than i.

4. List of integrals of Gaussian functions - Wikipedia

   en.wikipedia.org/wiki/List_of_integrals_of...

   In the previous two integrals, n!! is the double factorial: for even n it is equal to the product of all even numbers from 2 to n, and for odd n it is the product of all odd numbers from 1 to n; additionally it is assumed that 0!! = (−1)!! = 1.

5. Factorial - Wikipedia

   en.wikipedia.org/wiki/Factorial

   In mathematics, the factorial of a non-negative integer, denoted by !, is the product of all positive integers less than or equal to . The factorial of also equals the product of with the next smaller factorial: ! = () = ()! For example, ! =! = =

6. Wheat and chessboard problem - Wikipedia

   en.wikipedia.org/wiki/Wheat_and_chessboard_problem

   By the time that the fifth square is reached on the chessboard, the board contains a total of 31, or , grains of wheat.. The wheat and chessboard problem (sometimes expressed in terms of rice grains) is a mathematical problem expressed in textual form as:

7. U.S. October budget deficit jumps to $257 billion, handing ...

   www.aol.com/news/u-october-budget-deficit-jumps...

   WASHINGTON (Reuters) -The U.S. budget deficit jumped nearly four-fold to $257 billion in October, a figure inflated by one-off factors, the Treasury Department said on Wednesday in a report that ...