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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.

A003236 a(n) = Sum_{k=0..n} (-1)^(n-k) C(n,k)*C((k+1)^2, n).

Table of values

n a(n)
0 1
1 3
2 24
3 320
4 6122
5 153762
6 4794664
7 178788528
8 7762727196
9 384733667780
10 21434922419504
11 1326212860090560
12 90227121642144424
13 6694736236093168200
14 538028902298395832832
15 46558260925421295229568
16 4316186393637505403773328

List of values

[1, 3, 24, 320, 6122, 153762, 4794664, 178788528, 7762727196, 384733667780, 21434922419504, 1326212860090560, 90227121642144424, 6694736236093168200, 538028902298395832832, 46558260925421295229568, 4316186393637505403773328]

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

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