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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 (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
Vincent Pilaud, V. Pons, Permutrees, arXiv preprint arXiv:1606.09643 [math.CO], 2016.
CROSSREFS
Sequence in context: A060174 A052704 A151403 * A090004 A357404 A371675
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Jul 06 2017
STATUS
approved

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Last modified May 26 05:37 EDT 2024. Contains 372807 sequences. (Running on oeis4.)