%I #8 Dec 25 2018 22:35:58
%S 1,4,10,26,54,144
%N Expansion of generating function related to a certain class of combinatorial objects.
%C For precise definition see Example 15.3.6 of Miklos Bona, editor, Handbook of Enumerative Combinatorics, CRC Press, 2015, pages 1001-1002.
%D Miklos Bona, editor, Handbook of Enumerative Combinatorics, CRC Press, 2015, page 1002.
%Y Cf. A322059.
%K nonn,more
%O 1,2
%A _N. J. A. Sloane_, Dec 25 2018