A202219 Number of permutations avoiding the consecutive pattern 45312.

1, 2, 6, 24, 119, 708, 4914, 38977, 347794, 3448202, 37605875, 447411544, 5766612686, 80042208149, 1190366133003, 18882991058982, 318265784348321, 5679795502722184, 106993290279989932, 2121567147336853153, 44171924298572910714, 963472321485580749448

Offset

1,2

Comments

a(n) is the number of permutations on [n] that avoid the consecutive pattern 45312. It is the same as the number of permutations which avoid 21354.

Links

Ray Chandler, Table of n, a(n) for n = 1..40

A. Baxter, B. Nakamura, and D. Zeilberger. Automatic generation of theorems and proofs on enumerating consecutive Wilf-classes

Crossrefs

Cf. A177523, A202213-A202236.

Sequence in context: A202214 A202215 A202218 * A202223 A202220 A202226

Adjacent sequences: A202216 A202217 A202218 * A202220 A202221 A202222

Keyword

nonn

Author

Ray Chandler, Dec 15 2011

Status

approved