id:A116848 - OEIS Search Results

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Number of permutations of length n which avoid the patterns 231, 51234.

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1, 2, 5, 14, 41, 119, 336, 927, 2527, 6870, 18717, 51155, 140120, 384147, 1053147, 2886182, 7906953, 21657679, 59318944, 162475127, 445041287, 1219069014, 3339354501, 9147387195, 25057021032, 68637206987, 188013260835 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`Lara Pudwell, Systematic Studies in Pattern Avoidance, 2005.`
	FORMULA	`G.f.: A(x) = -{(3x^4-5x^3+7x^2-4x+1)x}/{4x^5-10x^4+17x^3-14x^2+6x-1}`
	CROSSREFS	`Sequence in context: A038989 A116850 A116847 this_sequence A122055 A116845 A116849` `Adjacent sequences: A116845 A116846 A116847 this_sequence A116849 A116850 A116851`
	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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