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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.

A331637 Number of binary matrices with nonzero rows, a total of n ones and each column with the same number of ones.

Table of values

n a(n)
1 1
2 4
3 14
4 89
5 542
6 5156
7 47294
8 570074
9 7103343
10 104493608
11 1622632574
12 28411638982
13 526858348382
14 10699857854372
15 230297862127828
16 5330284144906443
17 130370767029135902
18 3390229775073259800
19 92801587319328411134
20 2679531116538955252338

List of values

[1, 4, 14, 89, 542, 5156, 47294, 570074, 7103343, 104493608, 1622632574, 28411638982, 526858348382, 10699857854372, 230297862127828, 5330284144906443, 130370767029135902, 3390229775073259800, 92801587319328411134, 2679531116538955252338]

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

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