id:A038023 - OEIS Search Results

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

+0
3

0, 0, 0, 0, 0, 0, 3, 6, 0, 4, 96, 214, 128, 64, 38, 54248, 83925, 54223, 28254, 10223, 1894 (list; table; graph; listen)

	OFFSET	`0,7`
	LINKS	`Index entries for sequences related to groupoids`
	FORMULA	`Difference of A038021 and A038022.`
	CROSSREFS	`Cf. A001329, A001425, A030259, A030262, A030265.` `Sequence in context: A071105 A104613 A113565 this_sequence A008954 A141703 A021739` `Adjacent sequences: A038020 A038021 A038022 this_sequence A038024 A038025 A038026`
	KEYWORD	`nonn,tabl,more`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), May 15 1998.`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.