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A202235 Number of permutations avoiding the consecutive pattern 32415. 2
1, 2, 6, 24, 119, 708, 4915, 38992, 347990, 3450772, 37640794, 447908832, 5774077131, 80160465380, 1192342710241, 18917802834912, 318910800658728, 5692346715440768, 107249322475436984, 2127032690422975168, 44293813329642772714, 966307529386769800328 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(n) is the number of permutations on [n] that avoid the consecutive pattern 32415. It is the same as the number of permutations which avoid 15243, 34251 or 51423.

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: A202232 A202234 A202233 * A202236 A177523 A005395

Adjacent sequences:  A202232 A202233 A202234 * A202236 A202237 A202238

KEYWORD

nonn

AUTHOR

Ray Chandler, Dec 15 2011

STATUS

approved

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Last modified August 11 03:22 EDT 2020. Contains 336421 sequences. (Running on oeis4.)