id:A091489 - OEIS Search Results

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

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1, 0, 0, 0, 0, 1, 3, 7, 21, 57, 159, 435, 1217, 3400, 9633, 27413, 78733, 227489, 661984, 1937211, 5701733, 16865522, 50126650, 149627241, 448448400, 1349060262, 4072508115, 12333762442, 37466367898, 114133581762 (list; graph; listen)

	OFFSET	`1,7`
	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 A091488`
	CROSSREFS	`Sequence in context: A098545 A161707 A151267 this_sequence A047087 A104779 A091650` `Adjacent sequences: A091486 A091487 A091488 this_sequence A091490 A091491 A091492`
	KEYWORD	`nonn`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), Jan 14 2004`

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Last modified November 25 08:46 EST 2009. Contains 167481 sequences.

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