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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.

A360660 Number of inequivalent n X n {0,1} matrices modulo permutation of the rows, with exactly n 1's.

Table of values

n a(n)
0 1
1 1
2 4
3 20
4 133
5 1027
6 9259
7 94033
8 1062814
9 13176444
10 177427145
11 2573224238
12 39924120823
13 658921572675
14 11513293227271
15 212109149134617
16 4105637511110979
17 83238756058333277
18 1762856698153603049
19 38905470655863251479
20 892840913430059075405

List of values

[1, 1, 4, 20, 133, 1027, 9259, 94033, 1062814, 13176444, 177427145, 2573224238, 39924120823, 658921572675, 11513293227271, 212109149134617, 4105637511110979, 83238756058333277, 1762856698153603049, 38905470655863251479, 892840913430059075405]

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

Content is available under The OEIS End-User License Agreement.