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Number of alt-unary-binary trees with n nodes.
2

%I #9 Sep 19 2022 07:07:34

%S 1,1,2,2,2,4,4,4,4,6,8,8,8,8,8,12,12,14,16,16,16,16,16,16,24,24,24,26,

%T 28,28,32,32,32,32,32,32,32,40

%N Number of alt-unary-binary trees with n nodes.

%H Don Knuth, <a href="http://cs.stanford.edu/~knuth/papers/ambidextrous.pdf">Ambidextrous Numbers</a>, Preprint, September 2022. See (13.4).

%Y Cf. A355904-A355910, A355912, A355913.

%K nonn,more

%O 1,3

%A _N. J. A. Sloane_, Sep 19 2022