cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A289427 Sum of factorial-Catalan numbers over a certain family of decorations.

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%I A289427 #7 Jul 06 2017 16:49:10
%S A289427 1,4,32,320,3584,43264,553472,7441920,104740864
%N A289427 Sum of factorial-Catalan numbers over a certain family of decorations.
%C A289427 The precise definition involves the use of certain symbols akin to the peace symbol.
%H A289427 Vincent Pilaud, V. Pons, <a href="http://arxiv.org/abs/1606.09643">Permutrees</a>, arXiv preprint arXiv:1606.09643 [math.CO], 2016.
%Y A289427 Cf. A289428, A289429, A289430, A289431.
%K A289427 nonn,more
%O A289427 0,2
%A A289427 _N. J. A. Sloane_, Jul 06 2017