id:A116727 - OEIS Search Results

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Number of permutations of length n which avoid the patterns 321, 2134, 3412.

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1, 2, 5, 12, 22, 32, 42, 52, 62, 72, 82, 92, 102, 112, 122, 132, 142, 152, 162, 172, 182, 192, 202, 212, 222, 232, 242, 252, 262, 272 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`Lara Pudwell, Systematic Studies in Pattern Avoidance, 2005.`
	FORMULA	`G.f.: A(x) = {(3x^4+4x^3+2x^2+1)x}/{(x-1)^2}` `For n >= 4, a(n) = 10n - 28. - Franklin T. Adams-Watters, Sep 16 2006`
	CROSSREFS	`Sequence in context: A130916 A080838 A106331 this_sequence A116729 A048840 A116718` `Adjacent sequences: A116724 A116725 A116726 this_sequence A116728 A116729 A116730`
	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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