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A058123
Triangle: semigroups of order n with k idempotents, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).
+0
6
1, 2, 2, 5, 7, 6, 19, 37, 44, 26, 132, 216, 351, 326, 135, 3107, 1780, 3093, 4157, 2961, 875, 623615, 32652, 33445, 53145, 56020, 30395, 6749
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.
AT&T Labs Research
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