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A209643
A014486-indices for rooted plane trees where non-leaf branching can occur only at the leftmost branch of any level, but nowhere else.
3
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.
FORMULA
a(n) = A080300(A209641(n)).
CROSSREFS
Sequence in context: A351038 A113498 A036796 * A039123 A131618 A144111
KEYWORD
nonn
AUTHOR
Antti Karttunen, Mar 24 2012
STATUS
approved