id:A165536 - OEIS Search Results

Search: id:A165536

Displaying 1-1 of 1 results found.

page 1

Number of permutations of length n which avoid the patterns 1243 and 2341.

+0
1

1, 2, 6, 22, 88, 365, 1540, 6568, 28269, 122752, 537708, 2375500, 10579400, 47469377, 214454528, 974870969, 4456401809, 20474068387, 94490731125, 437872264778 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`These permutations have an enumeration scheme of depth 5.`
	LINKS	`V. Vatter, Enumeration schemes for restricted permutations`
	EXAMPLE	`There are 22 permutations of length 4 which avoid these two patterns, so a(4)=22.`
	CROSSREFS	`Sequence in context: A150263 A165534 A165535 this_sequence A032351 A165537 A165538` `Adjacent sequences: A165533 A165534 A165535 this_sequence A165537 A165538 A165539`
	KEYWORD	`nonn`
	AUTHOR	`Vince Vatter (vatter(AT)gmail.com), Sep 21 2009`

page 1

Search completed in 0.002 seconds

Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

AT&T Labs Research