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A030260
Number of nonisomorphic commutative groupoids with no idempotents.
2
1, 0, 1, 38, 13872, 83360520, 10203847031340, 31023254154131753920, 2765562268014305034000397632, 8332535835277886736134596954072281240, 960864308045670310058158724983067048253497223280
(list; graph; refs; listen; history; text; internal format)
OFFSET
0,4
LINKS
Table of n, a(n) for n=0..10.
Index entries for sequences related to groupoids
CROSSREFS
Cf. A001329, A001425, A038021.
Sequence in context: A355589 A145120 A183581 * A145122 A134182 A110017
Adjacent sequences: A030257 A030258 A030259 * A030261 A030262 A030263
KEYWORD
nonn
AUTHOR
Christian G. Bower, Feb 15 1998 and May 15 1998
STATUS
approved

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Last modified November 16 02:02 EST 2024. Contains 377778 sequences.
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