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A200406 Number of permutations avoiding the pattern 12-3-4. 0
1, 2, 6, 23, 105, 550, 3228, 20878, 146994, 1116000, 9068288, 78384726, 717102126, 6913783826, 69991576572 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..15.

Andrew M. Baxter and Lara K. Pudwell, Enumeration schemes for dashed patterns, arXiv preprint arXiv:1108.2642 [math.CO], 2011.

CROSSREFS

Sequence in context: A137548 A080108 A113227 * A165489 A192315 A288912

Adjacent sequences:  A200403 A200404 A200405 * A200407 A200408 A200409

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Nov 17 2011

EXTENSIONS

a(11)-a(15) from Lars Blomberg, Apr 16 2018

STATUS

approved

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Last modified April 19 04:19 EDT 2019. Contains 322237 sequences. (Running on oeis4.)