id:A091487 - OEIS Search Results

Search: id:A091487

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Number of unlabeled 2,3 cacti (triangular cacti with bridges).

+0
2

1, 1, 2, 3, 7, 16, 41, 106, 304, 880, 2674, 8284, 26347, 85076, 279324, 928043, 3118915, 10580145, 36199094, 124774041, 432990333, 1511628113, 5306305978, 18719781786, 66342222729, 236100395649, 843490024052, 3024220006717 (list; graph; listen)

	OFFSET	`1,3`
	LINKS	`Index entries for sequences related to cacti`
	FORMULA	`G.f.: A(x) = B(x)-B(x)^2/2+B(x^2)/2+B(x^3)/3-B(x)^3/3 where B is g.f. of A091486`
	CROSSREFS	`Sequence in context: A081207 A027118 A114582 this_sequence A122031 A089125 A002854` `Adjacent sequences: A091484 A091485 A091486 this_sequence A091488 A091489 A091490`
	KEYWORD	`nonn`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), Jan 14 2004`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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