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The difference between any perfect square and its predecessor is given by the identity n 2 − (n − 1) 2 = 2n − 1.Equivalently, it is possible to count square numbers by adding together the last square, the last square's root, and the current root, that is, n 2 = (n − 1) 2 + (n − 1) + n.
The mound where the tomb is located Plan of the Qin Shi Huang Mausoleum and location of the Terracotta Army ().The central tomb itself has yet to be excavated. [4]The construction of the tomb was described by the historian Sima Qian (145–90 BCE) in the Records of the Grand Historian, the first of China's 24 dynastic histories, which was written a century after the mausoleum's completion.