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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.

A331636 Number of nonnegative integer matrices with nonzero rows, total sum n and columns with equal sums.

Table of values

n a(n)
1 1
2 5
3 17
4 109
5 557
6 5785
7 47357
8 596365
9 7151841
10 106763725
11 1622633597
12 28757539337
13 526858352477
14 10758375762109
15 230342261913169
16 5344946955452877
17 130370767029201437
18 3394996816992588345
19 92801587319328673277
20 2681375183085608280093

List of values

[1, 5, 17, 109, 557, 5785, 47357, 596365, 7151841, 106763725, 1622633597, 28757539337, 526858352477, 10758375762109, 230342261913169, 5344946955452877, 130370767029201437, 3394996816992588345, 92801587319328673277, 2681375183085608280093]

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

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