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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.

A383886 Number of 3-nilpotent semigroups, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).

Table of values

n a(n)
1 0
2 0
3 1
4 8
5 84
6 2660
7 609797
8 1831687022
9 52966239062973
10 12417282095522918811
11 26530703289252298687053072
12 1008860098093547692911901804990610
13 1378288413994605341053354105969660808031163
14 36959929418354255758713676933402538920157765946956889
15 14799968982226242179794503639146983952853044950740907666303436922

List of values

[0, 0, 1, 8, 84, 2660, 609797, 1831687022, 52966239062973, 12417282095522918811, 26530703289252298687053072, 1008860098093547692911901804990610, 1378288413994605341053354105969660808031163, 36959929418354255758713676933402538920157765946956889, 14799968982226242179794503639146983952853044950740907666303436922]

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

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