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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.

A357410 a(n) is the number of covering relations in the poset P of n X n idempotent matrices over GF(2) ordered by A <= B if and only if AB = BA = A.

Table of values

n a(n)
0 0
1 1
2 12
3 224
4 6960
5 397792
6 42001344
7 8547291008
8 3336917303040
9 2565880599084544
10 3852698988517260288
11 11517943538435677485056
12 67829192662051610706309120
13 799669932659456441970547744768
14 18652191511341505602408972738871296
15 873360272626100960024734923878091948032

List of values

[0, 1, 12, 224, 6960, 397792, 42001344, 8547291008, 3336917303040, 2565880599084544, 3852698988517260288, 11517943538435677485056, 67829192662051610706309120, 799669932659456441970547744768, 18652191511341505602408972738871296, 873360272626100960024734923878091948032]

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

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