id:A116728 - OEIS Search Results

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Number of permutations of length n which avoid the patterns 321, 1243, 2134.

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1, 2, 5, 12, 19, 26, 33, 40, 47, 54, 61, 68, 75, 82, 89, 96, 103, 110, 117, 124, 131, 138, 145, 152, 159, 166, 173, 180, 187, 194 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`Lara Pudwell, Systematic Studies in Pattern Avoidance, 2005.`
	FORMULA	`G.f.: A(x) = {(4x^3+2x^2+1)x}/{(x-1)^2}` `For n >= 3, a(n) = 7n - 16. - Franklin T. Adams-Watters, Sep 16 2006`
	CROSSREFS	`Sequence in context: A085395 A041641 A131091 this_sequence A095306 A079648 A130916` `Adjacent sequences: A116725 A116726 A116727 this_sequence A116729 A116730 A116731`
	KEYWORD	`nonn,easy,more`
	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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