id:A116707 - OEIS Search Results

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Number of permutations of length n which avoid the patterns 1342, 4213.

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1, 2, 6, 22, 86, 338, 1318, 5106, 19718, 76066, 293398, 1131794, 4366374, 16846018, 64995254, 250765298, 967503814, 3732821922, 14401956182, 55565542354, 214382633062, 827129764994, 3191227078902, 12312373271986, 47503525349126 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`Lara Pudwell, Systematic Studies in Pattern Avoidance, 2005.`
	FORMULA	`G.f.: A(x) = -{x(x-1)(2x-1)^2}/{4x^4-16x^3+16x^2-7x+1}`
	CROSSREFS	`Sequence in context: A116706 A116709 A116710 this_sequence A116704 A029759 A107243` `Adjacent sequences: A116704 A116705 A116706 this_sequence A116708 A116709 A116710`
	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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