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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.

A228809 G.f.: exp( Sum_{n>=1} x^n/n * Sum_{k=0..n} binomial(n*k, k^2) ).

Table of values

n a(n)
0 1
1 2
2 4
3 12
4 94
5 2195
6 158904
7 31681195
8 13904396167
9 15305894726347
10 44888344014554903
11 288228807835914177564
12 4270880356112396772814732
13 169380654509201278629725097906
14 15394658527137259981745081997280638
15 3042352591056504014301304188228238554499

List of values

[1, 2, 4, 12, 94, 2195, 158904, 31681195, 13904396167, 15305894726347, 44888344014554903, 288228807835914177564, 4270880356112396772814732, 169380654509201278629725097906, 15394658527137259981745081997280638, 3042352591056504014301304188228238554499]

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

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