A209643 A014486-indices for rooted plane trees where non-leaf branching can occur only at the leftmost branch of any level, but nowhere else.

0, 1, 2, 3, 4, 6, 7, 8, 9, 14, 16, 17, 19, 20, 21, 22, 23, 37, 42, 44, 45, 51, 53, 54, 56, 57, 58, 60, 61, 62, 63, 64, 65, 107, 121, 126, 128, 129, 149, 154, 156, 157, 163, 165, 166, 168, 169, 170, 177, 179, 180, 182, 183, 184, 186, 187, 188, 189, 191, 192, 193, 194, 195, 196, 197, 329, 371, 385, 390, 392, 393, 461, 475, 480, 482

Offset

0,3

Comments

5 is not member of this sequence, as it encodes in A014486 a general tree:

..|

\/

which has a nonempty branch which is not the leftmost child of its parent vertex.

Links

Antti Karttunen, Table of n, a(n) for n = 0..32767

A. Karttunen, Corresponding trees illustrated on 1, 2, 3, 4, 6, 7, 8, 9, 14, 16, 17th, etc. row in this illustration.

Formula

a(n) = A080300(A209641(n)).

Crossrefs

Cf. A209644, A071163.

Sequence in context: A351038 A113498 A036796 * A039123 A131618 A144111

Adjacent sequences: A209640 A209641 A209642 * A209644 A209645 A209646

Keyword

nonn

Author

Antti Karttunen, Mar 24 2012

Status

approved