id:A038021 - OEIS Search Results

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Triangle: T(n,k), k<=n: commutative groupoids with n elements and k idempotents.

+0
4

1, 0, 1, 1, 2, 1, 38, 57, 27, 7, 13872, 18544, 9280, 2080, 192, 83360520, 104208775, 52110500, 13035000, 1632750, 82355 (list; table; graph; listen)

	OFFSET	`0,5`
	LINKS	`Index entries for sequences related to groupoids`
	CROSSREFS	`Cf. A001329, A001425, A030257, A030260, A030263.` `Sequence in context: A113456 A127608 A038022 this_sequence A127609 A100018 A109347` `Adjacent sequences: A038018 A038019 A038020 this_sequence A038022 A038023 A038024`
	KEYWORD	`nonn,tabl,more`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), May 15 1998.`

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Last modified December 13 23:45 EST 2009. Contains 170824 sequences.

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