id:A116798 - OEIS Search Results

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Number of permutations of length n which avoid the patterns 1234, 1342, 1432.

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1, 2, 6, 21, 76, 277, 1012, 3702, 13553, 49642, 181885, 666542, 2442922, 8954133, 32821408, 120310377, 441018216, 1616644946, 5926191305, 21723934190, 79634709513, 291922123258, 1070118922286, 3922810609205, 14380129657444 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`Lara Pudwell, Systematic Studies in Pattern Avoidance, 2005.`
	FORMULA	`G.f.: A(x) = -{x(2x-1)(x^2-3x+1)}/{3x^4-11x^3+15x^2-7x+1}`
	CROSSREFS	`Adjacent sequences: A116795 A116796 A116797 this_sequence A116799 A116800 A116801` `Sequence in context: A116782 A112091 A108146 this_sequence A116821 A116772 A131792`
	KEYWORD	`nonn,easy`
	AUTHOR	`Lara Pudwell (lpudwell(AT)math.rutgers.edu), Feb 26 2006`

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Last modified October 12 15:26 EDT 2008. Contains 144830 sequences.

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