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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.

A331643 Number of binary matrices with distinct 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 3
3 13
4 81
5 541
6 4803
7 47293
8 552009
9 7088365
10 102697083
11 1622632573
12 28141672449
13 526858348381
14 10648798871763
15 230283520498573
16 5317134540336849
17 130370767029135901
18 3385908728450965323
19 92801587319328411133
20 2677804893723072559401
21 81124826179976677328845

List of values

[1, 3, 13, 81, 541, 4803, 47293, 552009, 7088365, 102697083, 1622632573, 28141672449, 526858348381, 10648798871763, 230283520498573, 5317134540336849, 130370767029135901, 3385908728450965323, 92801587319328411133, 2677804893723072559401, 81124826179976677328845]

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

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