A289429 Sum of factorial-Catalan numbers over a certain family of decorations.

1, 3, 18, 126, 936, 7164, 55800, 439560, 3489696

Offset

0,2

Comments

The precise definition involves the use of certain symbols akin to the peace symbol.

Links

Table of n, a(n) for n=0..8.

Vincent Pilaud, V. Pons, Permutrees, arXiv preprint arXiv:1606.09643 [math.CO], 2016.

Crossrefs

Cf. A289427, A289428, A289430, A289431.

Sequence in context: A365130 A349024 A176277 * A004987 A340894 A363560

Adjacent sequences: A289426 A289427 A289428 * A289430 A289431 A289432

Keyword

nonn,more

Author

N. J. A. Sloane, Jul 06 2017

Status

approved