id:A116850 - OEIS Search Results

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Number of permutations of length n which avoid the patterns 231, 12354.

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1, 2, 5, 14, 41, 119, 334, 902, 2351, 5945, 14660, 35408, 84061, 196715, 454778, 1040522, 2359451, 5308589, 11862208, 26345684, 58196201, 127926527, 279970070, 610271534, 1325400391, 2868904289, 6190793084, 13321109912, 28588376501 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`Lara Pudwell, Systematic Studies in Pattern Avoidance, 2005.`
	FORMULA	`G.f.: A(x) = -{x(7x^5-20x^4+28x^3-20x^2+7x-1)}/{(2x-1)^3(x-1)^3}`
	CROSSREFS	`Adjacent sequences: A116847 A116848 A116849 this_sequence A116851 A116852 A116853` `Sequence in context: A116844 A116851 A038989 this_sequence A116847 A116848 A122055`
	KEYWORD	`nonn,easy`
	AUTHOR	`Lara Pudwell (lpudwell(AT)math.rutgers.edu), Feb 26 2006`

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Last modified October 13 17:46 EDT 2008. Contains 145008 sequences.

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