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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A212805 a(n) = (1-(n-1)/2^n)*(n!)^n.

Table of values

n a(n)
0 2
1 1
2 3
3 162
4 269568
5 21772800000
6 128430157824000000
7 78734235726376796160000000
8 6793969131008738346811156070400000000
9 107405833909078014660339510303458240495616000000000
10 392460917103771065568880570648836410770980864000000000000000000000
11 407931390497527236736237611020825246476822200409679741237329920000000000000000000000

List of values

[2, 1, 3, 162, 269568, 21772800000, 128430157824000000, 78734235726376796160000000, 6793969131008738346811156070400000000, 107405833909078014660339510303458240495616000000000, 392460917103771065568880570648836410770980864000000000000000000000, 407931390497527236736237611020825246476822200409679741237329920000000000000000000000]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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