%I
%S 1,3,8,21,50,128
%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 10011002.
%D Miklos Bona, editor, Handbook of Enumerative Combinatorics, CRC Press, 2015, page 1002.
%Y Cf. A322060.
%K nonn,more
%O 1,2
%A _N. J. A. Sloane_, Dec 25 2018
