id:A165534 - OEIS Search Results

Search: id:A165534

Displaying 1-1 of 1 results found.

page 1

Number of permutations of length n which avoid the patterns 1243 and 2431.

+0
1

1, 2, 6, 22, 88, 363, 1507, 6241, 25721, 105485, 430767, 1752945, 7113095, 28797292, 116368938, 469531170, 1892133076, 7617145998, 30638026074, 123145086046 (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: A101043 A101046 A150263 this_sequence A165535 A165536 A032351` `Adjacent sequences: A165531 A165532 A165533 this_sequence A165535 A165536 A165537`
	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