A289430 - OEIS

%I #9 Jul 06 2017 16:48:56

%S 1,3,18,135,1134,10287,99306,1014039,10933542

%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, A289429, A289431.

%K nonn,more

%O 0,2

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