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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.

A386454 a(0) = 1; a(n) = a(n-1) + Sum_{k=0..n-1} binomial(k+3,4) * a(k) * a(n-1-k).

Table of values

n a(n)
0 1
1 1
2 2
3 13
4 220
5 8148
6 586948
7 75141039
8 15930666825
9 5289069956220
10 2628685323745449
11 1884772989271329869
12 1890430039448133854031
13 2584219798288871040676608
14 4708450397910844142927823544
15 11215531466814325127916787062534
16 34341962107081618846057340207455738

List of values

[1, 1, 2, 13, 220, 8148, 586948, 75141039, 15930666825, 5289069956220, 2628685323745449, 1884772989271329869, 1890430039448133854031, 2584219798288871040676608, 4708450397910844142927823544, 11215531466814325127916787062534, 34341962107081618846057340207455738]

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

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