id:A116847 - OEIS Search Results

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Number of permutations of length n which avoid the patterns 123, 51432.

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1, 2, 5, 14, 41, 119, 336, 924, 2492, 6636, 17536, 46137, 121095, 317434, 831571, 2177734, 5702191, 14929519, 39087182, 102332996, 267912946, 701407172, 1836310110, 4807524929, 12586266701, 32951277474, 86267568321, 225851430414 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`Lara Pudwell, Systematic Studies in Pattern Avoidance, 2005.`
	FORMULA	`G.f.: A(x) = -{(x^5-5x^4+9x^3-10x^2+5x-1)x}/{(x-1)^4(x^2-3x+1)}`
	CROSSREFS	`Sequence in context: A116851 A038989 A116850 this_sequence A116848 A122055 A116845` `Adjacent sequences: A116844 A116845 A116846 this_sequence A116848 A116849 A116850`
	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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