id:A116849 - OEIS Search Results

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Number of permutations of length n which avoid the patterns 213, 51432.

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1, 2, 5, 14, 41, 121, 356, 1044, 3057, 8948, 26192, 76674, 224465, 657137, 1923817, 5632105, 16488346, 48270655, 141315320, 413709331, 1211159679, 3545745012, 10380388294, 30389230117, 88966354626, 260454516946, 762496740130 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`Lara Pudwell, Systematic Studies in Pattern Avoidance, 2005.`
	FORMULA	`G.f.: A(x) = -{x(x-1)^3}/{-6x^3+x^4+8x^2-5x+1}`
	CROSSREFS	`Sequence in context: A116848 A122055 A116845 this_sequence A007051 A124302 A123183` `Adjacent sequences: A116846 A116847 A116848 this_sequence A116850 A116851 A116852`
	KEYWORD	`nonn,easy`
	AUTHOR	`Lara Pudwell (Lara.Pudwell(AT)valpo.edu), Feb 26 2006`

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.

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