id:A165537 - OEIS Search Results

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Number of permutations of length n which avoid the patterns 4213 and 2143.

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1, 2, 6, 22, 88, 366, 1556, 6720, 29396, 129996, 580276, 2611290 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`There are 22 permutations of length 4 which avoid these two patterns, so a(4)=22.`
	CROSSREFS	`Sequence in context: A165535 A165536 A032351 this_sequence A165538 A165539 A109033` `Adjacent sequences: A165534 A165535 A165536 this_sequence A165538 A165539 A165540`
	KEYWORD	`nonn`
	AUTHOR	`Vince Vatter (vatter(AT)gmail.com), Sep 21 2009`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.