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Sum of factorial-Catalan numbers over a certain family of decorations.
4

%I #9 Jul 06 2017 16:49:03

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

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

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

%H Vincent Pilaud, V. Pons, <a href="http://arxiv.org/abs/1606.09643">Permutrees</a>, arXiv preprint arXiv:1606.09643 [math.CO], 2016.

%Y Cf. A289427, A289428, A289430, A289431.

%K nonn,more

%O 0,2

%A _N. J. A. Sloane_, Jul 06 2017