id:A116843 - OEIS Search Results

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Number of permutations of length n which avoid the patterns 1342, 3241, 4312.

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1, 2, 6, 21, 73, 241, 759, 2305, 6806, 19652, 55725, 155688, 429719, 1174344, 3183298, 8571979, 22958381, 61220351, 162668347, 430978487, 1139179386, 3005433282, 7916965441, 20829348046, 54747238203, 143781463846 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`Lara Pudwell, Systematic Studies in Pattern Avoidance, 2005.`
	FORMULA	`G.f.: A(x) = -{(8x^7-26x^6+60x^5-87x^4+73x^3-35x^2+9x-1)x}/{(2x-1)^2(x-1)^4(x^2-3x+1)}`
	CROSSREFS	`Sequence in context: A116787 A116773 A116741 this_sequence A116822 A116797 A116744` `Adjacent sequences: A116840 A116841 A116842 this_sequence A116844 A116845 A116846`
	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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