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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
OFFSET
1,2
LINKS
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
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Nov 17 2011
EXTENSIONS
a(11)-a(15) from Lars Blomberg, Apr 16 2018
STATUS
approved