id:A116801 - OEIS Search Results

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Number of permutations of length n which avoid the patterns 1234, 1432, 2413.

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1, 2, 6, 21, 71, 229, 726, 2299, 7296, 23180, 73648, 233935, 742924, 2359143, 7491146, 23786672, 75528789, 239820410, 761475614, 2417816525, 7676955811, 24375507011, 77395827653, 245742882637, 780268393400, 2477461176578 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`Lara Pudwell, Systematic Studies in Pattern Avoidance, 2005.`
	FORMULA	`G.f.: A(x) = -{(x^7-x^6+3x^5-3x^4+9x^3-10x^2+5x-1)x}/{x^8-x^7+4x^6-7x^5+19x^4-24x^3+18x^2-7x+1}`
	CROSSREFS	`Sequence in context: A116761 A116807 A116785 this_sequence A116750 A116791 A116775` `Adjacent sequences: A116798 A116799 A116800 this_sequence A116802 A116803 A116804`
	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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