A234283 Number of 321-avoiding extensions of comb K_{s,3}^{alpha}.

1, 10, 161, 3196

Offset

1,2

Comments

No formula is presently known.

Links

Table of n, a(n) for n=1..4.

S. Yakoubov, Pattern Avoidance in Extensions of Comb-Like Posets, arXiv preprint arXiv:1310.2979, 2013

Crossrefs

Sequence in context: A366037 A090374 A034724 * A074703 A190903 A303486

Adjacent sequences: A234280 A234281 A234282 * A234284 A234285 A234286

Keyword

nonn,more

Author

N. J. A. Sloane, Dec 28 2013

Status

approved