A200406 Number of permutations avoiding the pattern 12-3-4.

1, 2, 6, 23, 105, 550, 3228, 20878, 146994, 1116000, 9068288, 78384726, 717102126, 6913783826, 69991576572

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 A352367 A192315

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