A355911 Number of alt-unary-binary trees with n nodes.

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, 28, 28, 32, 32, 32, 32, 32, 32, 32, 40

Offset

1,3

Links

Table of n, a(n) for n=1..38.

Don Knuth, Ambidextrous Numbers, Preprint, September 2022. See (13.4).

Crossrefs

Cf. A355904-A355910, A355912, A355913.

Sequence in context: A289256 A287155 A287654 * A369207 A113402 A238726

Adjacent sequences: A355908 A355909 A355910 * A355912 A355913 A355914

Keyword

nonn,more

Author

N. J. A. Sloane, Sep 19 2022

Status

approved