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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.

A037293 a(n) = Sum_{i=0..2^(n-1)} binomial(2^(n-1), i)^2.

Table of values

n a(n)
0 1
1 2
2 6
3 70
4 12870
5 601080390
6 1832624140942590534
7 23951146041928082866135587776380551750
8 5768658823449206338089748357862286887740211701975162032608436567264518750790

List of values

[1, 2, 6, 70, 12870, 601080390, 1832624140942590534, 23951146041928082866135587776380551750, 5768658823449206338089748357862286887740211701975162032608436567264518750790]

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

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