id:A128805 - OEIS Search Results

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Number of valley-avoiding compositions with parts in N.

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1

1, 1, 2, 4, 8, 15, 28, 52, 96, 177, 326, 600, 1104, 2032, 3740, 6884, 12672, 23327, 42942, 79052, 145528, 267905, 493192, 907928, 1671424, 3076959, 5664436, 10427772, 19196688, 35339553, 65057260, 119765152, 220477952, 405882064 (list; graph; listen)

	OFFSET	`0,3`
	LINKS	`Milan Janjic, Enumerative Formulas for Some Functions on Finite Sets` `S. Heubach and T. Mansour, Enumeration of 3-letter patterns in combinations`
	FORMULA	`The Heubach/Mansour paper has a complicated g.f.`
	CROSSREFS	`Sequence in context: A008936 A073769 A008937 this_sequence A049864 A118870 A088532` `Adjacent sequences: A128802 A128803 A128804 this_sequence A128806 A128807 A128808`
	KEYWORD	`nonn`
	AUTHOR	`Ralf Stephan, May 08 2007`
	EXTENSIONS	`More terms from Vladeta Jovovic (vladeta(AT)Eunet.yu), Oct 04 2007`

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Last modified July 24 12:00 EDT 2008. Contains 142294 sequences.

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