A278026 Number of 1324-avoiding permutations of length n with a non-intersecting boundary of type (t, 2), for some integer t >= 1,

0, 0, 1, 1, 4, 14, 49, 174, 626, 2276, 8346, 30821, 114495, 427481

Offset

0,5

Links

Table of n, a(n) for n=0..13.

C. Bean, M. Tannock and H. Ulfarsson, Pattern avoiding permutations and independent sets in graphs, arXiv:1512.08155 [math.CO], 2015. See Prop. 5.17.

Crossrefs

Sequence in context: A071741 A211305 A316974 * A001894 A215493 A079309

Adjacent sequences: A278023 A278024 A278025 * A278027 A278028 A278029

Keyword

nonn,more

Author

N. J. A. Sloane, Nov 09 2016

Status

approved