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Expansion of generating function related to a certain class of combinatorial objects.
1

%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