id:A134044 - OEIS Search Results

Search: id:A134044

Displaying 1-1 of 1 results found.

page 1

Number of compositions of n with parts in N which avoid the pattern 221.

+0
2

1, 1, 2, 4, 8, 15, 30, 58, 113, 220, 429, 835, 1627, 3169, 6172, 12023, 23419, 45616, 88853, 173073, 337118, 656656, 1279065, 2491423, 4852911, 9452731, 18412473, 35864686, 69858930, 136074521, 265052378, 516281541, 1005637564, 1958828336 (list; graph; listen)

	OFFSET	`0,3`
	LINKS	`S. Heubach and T. Mansour, Enumeration of 3-letter patterns in compositions`
	FORMULA	`G.f.: 1/(1-Sum(x^jProduct(1-x^(2i),i=j+1..inf),j=1..inf)).`
	CROSSREFS	`Sequence in context: A077596 A091865 A065494 this_sequence A079967 A018088 A018089` `Adjacent sequences: A134041 A134042 A134043 this_sequence A134045 A134046 A134047`
	KEYWORD	`nonn`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)Eunet.yu), Oct 03 2007`

page 1

Search completed in 0.002 seconds

Last modified December 4 21:35 EST 2008. Contains 151309 sequences.

AT&T Labs Research