id:A140190 - OEIS Search Results

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a(n) is the number of groupoids (categories all of whose morphisms are invertible) with m morphisms and m-n objects for any m>=2n.

+0
2

1, 1, 3, 5, 9, 15, 27, 44, 71, 113, 176, 271, 413, 621, 927, 1375, 2004, 2924, 4213 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`Limiting values of A140188, i.e., a(n) = T140188(m,m-n) for any m>=2n.`
	CROSSREFS	`Sequence in context: A018342 A029485 A147087 this_sequence A083658 A018436 A018298` `Adjacent sequences: A140187 A140188 A140189 this_sequence A140191 A140192 A140193`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Jubin (benoit_jubin(AT)yahoo.fr), May 12 2008`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.