A202224 Number of permutations avoiding the consecutive pattern 42351.

1, 2, 6, 24, 119, 708, 4914, 38980, 347837, 3448792, 37614098, 447530960, 5768427763, 80071232808, 1190854748337, 18891645882204, 318426891675529, 5682942507677216, 107057693682517823, 2122945762085834896, 44202742291011618712, 964190646266565855612

Offset

1,2

Comments

a(n) is the number of permutations on [n] that avoid the consecutive pattern 42351. It is the same as the number of permutations which avoid 15324, 24315 or 51342.

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: A202226 A202227 A202229 * A202225 A202231 A202228

Adjacent sequences: A202221 A202222 A202223 * A202225 A202226 A202227

Keyword

nonn

Author

Ray Chandler, Dec 15 2011

Status

approved