id:A128761 - OEIS Search Results

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Number of compositions of n with parts in N which avoid the pattern 123.

+0
1

1, 1, 2, 4, 8, 16, 31, 61, 119, 232, 453, 883, 1721, 3354, 6536, 12735, 24813, 48344, 94189, 183506, 357518, 696534, 1357019, 2643798, 5150746, 10034865, 19550268, 38088486, 74205248, 144569092, 281654211, 548727863, 1069049370, 2082756500 (list; graph; listen)

	OFFSET	`0,3`
	LINKS	`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: A152718 A006775 A104993 this_sequence A001591 A003240 A018487` `Adjacent sequences: A128758 A128759 A128760 this_sequence A128762 A128763 A128764`
	KEYWORD	`nonn`
	AUTHOR	`Ralf Stephan, May 08 2007`
	EXTENSIONS	`More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Oct 03 2007`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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