A289431 - OEIS

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A289431

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

4

1, 2, 8, 40, 224, 1360, 8864, 61984, 467072

(list; graph; refs; listen; history; text; internal format)

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, A289429, A289430.

Sequence in context: A052701 A151374 A177408 * A337912 A085485 A089603

Adjacent sequences: A289428 A289429 A289430 * A289432 A289433 A289434

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Jul 06 2017

STATUS

approved