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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.

A336217 a(0) = 1; a(n) = 2 * Sum_{k=0..n-1} binomial(n,k)^2 * a(k).

Table of values

n a(n)
0 1
1 2
2 18
3 362
4 12946
5 723402
6 58208490
7 6375093258
8 911949196434
9 165104835435146
10 36903191037412618
11 9980525774650881738
12 3212329170232153022314
13 1213419234370490738427722
14 531582989226188067128503722
15 267336170027296964096123899962

List of values

[1, 2, 18, 362, 12946, 723402, 58208490, 6375093258, 911949196434, 165104835435146, 36903191037412618, 9980525774650881738, 3212329170232153022314, 1213419234370490738427722, 531582989226188067128503722, 267336170027296964096123899962]

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

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