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A005591
Number of semigroups of order n with 3 idempotents, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).
(Formerly M4246)
+0
2
6, 44, 351, 3093, 33445
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 5 08:23 EST 2009. Contains 170348 sequences.
AT&T Labs Research
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