%I #4 Jun 03 2012 09:56:46
%S 0,2,6,56,270
%N Number of certain marked rooted punctured quadrangulations with n weighted edges.
%C See reference for precise definition.
%D Liskovets, Valery A. A reductive technique for enumerating non-isomorphic planar maps. Discrete Math. 156 (1996), no. 1-3, 197--217. MR1405018 (97f:05087) (See Q'_1(n).)
%K nonn
%O 0,2
%A _N. J. A. Sloane_, Jun 03 2012