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A289427
Sum of factorial-Catalan numbers over a certain family of decorations.
4
1, 4, 32, 320, 3584, 43264, 553472, 7441920, 104740864
OFFSET
0,2
COMMENTS
The precise definition involves the use of certain symbols akin to the peace symbol.
LINKS
Vincent Pilaud, V. Pons, Permutrees, arXiv preprint arXiv:1606.09643 [math.CO], 2016.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Jul 06 2017
STATUS
approved