A140189 - OEIS

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A140189

Number of groupoids (categories all of whose morphisms are invertible) with n morphisms.

1, 1, 2, 3, 7, 9, 16, 22, 42, 57, 90, 124, 204, 275, 413, 562, 866, 1161, 1685, 2264, 3308, 4407 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	COMMENTS	`Row sums of A140188 (see comments and formula there).`
	CROSSREFS	`Cf. A140185, A140188.` `Sequence in context: A135369 A109660 A075855 * A165803 A204520 A007649` `Adjacent sequences: A140186 A140187 A140188 * A140190 A140191 A140192`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Jubin (benoit_jubin(AT)yahoo.fr), May 12 2008`

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Last modified February 13 08:12 EST 2012. Contains 205451 sequences.