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A030263 Number of nonisomorphic commutative groupoids with 1 idempotent. 2
1, 2, 57, 18544, 104208775, 12244640803344, 36193798266945468968, 3160642595226430678271332032, 9374102814860736866561050257041372709, 1067627008939949742128760399369846160513647927040 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
CROSSREFS
Sequence in context: A324318 A058196 A024237 * A359242 A090743 A104494
KEYWORD
nonn,nice
AUTHOR
Christian G. Bower, Feb 15 1998 and May 15 1998
STATUS
approved

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Last modified February 29 14:32 EST 2024. Contains 370425 sequences. (Running on oeis4.)