id:A116706 - OEIS Search Results

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Number of permutations of length n which avoid the patterns 2134, 3421.

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1, 2, 6, 22, 86, 330, 1206, 4174, 13726, 43134, 130302, 380414, 1078270, 2978814, 8046590, 21311486, 55468030, 142147582, 359268350, 896794622, 2213543934, 5408292862, 13091995646, 31424774142, 74845257726, 176991240190 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`Lara Pudwell, Systematic Studies in Pattern Avoidance, 2005.`
	FORMULA	`G.f.: A(x) = {4x^6-28x^5+64x^4-64x^3+34x^2-9x+1)x}/{(x-1)(2x-1)^5}`
	CROSSREFS	`Sequence in context: A079104 A116705 A116708 this_sequence A116709 A116710 A116707` `Adjacent sequences: A116703 A116704 A116705 this_sequence A116707 A116708 A116709`
	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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