id:A165539 - OEIS Search Results

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Number of permutations of length n which avoid the patterns 4213 and 3421.

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1

1, 2, 6, 22, 88, 367, 1571, 6861, 30468, 137229, 625573, 2881230 (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: A032351 A165537 A165538 this_sequence A109033 A049135 A049127` `Adjacent sequences: A165536 A165537 A165538 this_sequence A165540 A165541 A165542`
	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.