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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.

A046856 a(n) = (2^n)!/4^n, with a(1)=1, a(2)=2.

Table of values

n a(n)
1 1
2 2
3 630
4 81729648000
5 256963707943060088053923840000000
6 30978254928194376001814792318154658399137088909801072314160618743948902400000000000000

List of values

[1, 2, 630, 81729648000, 256963707943060088053923840000000, 30978254928194376001814792318154658399137088909801072314160618743948902400000000000000]

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

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