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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.

A178324 G.f.: A(x) = Sum_{n>=0} x^n/[Sum_{k=0..n} C(n,k)^2*(-x)^k].

Table of values

n a(n)
0 1
1 1
2 2
3 6
4 26
5 146
6 1024
7 8776
8 89670
9 1071174
10 14749528
11 231333872
12 4090080388
13 80808196548
14 1770893277532
15 42769289395020
16 1131848169152498
17 32655896028179970
18 1022576267852973448
19 34612454839065740688

List of values

[1, 1, 2, 6, 26, 146, 1024, 8776, 89670, 1071174, 14749528, 231333872, 4090080388, 80808196548, 1770893277532, 42769289395020, 1131848169152498, 32655896028179970, 1022576267852973448, 34612454839065740688]

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

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