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A080299 A014486-encoding of plane binary trees (Stanley's d) whose interior zigzag-tree (Stanley's c, i.e., tree obtained by discarding the outermost edges of the binary tree) is isomorphic to a valid plane binary tree (Stanley's d). 5
2, 50, 818, 914, 13106, 13202, 14642, 14738, 15506, 209714, 209810, 211250, 211346, 212114, 234290, 234386, 235826, 235922, 236690, 248114, 248210, 248978, 255122, 3355442, 3355538, 3356978, 3357074, 3357842, 3380018, 3380114, 3381554 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,1
COMMENTS
These trees are obtained by replacing each non-root terminal node (a leaf) of the binary tree with a branch of two leaves, i.e., "." -> "\/".
LINKS
A. Karttunen, Nine initial trees can be found here (The trees with the ordinal numbers 1., 6., 39., 53., 345., 359., 477., 491. and 567.)
FORMULA
a(n) = A080310(A014486(n)).
CROSSREFS
a(n) = A014486(A080298(n)). Breadth-first-wise encoding: A080313.
Sequence in context: A048610 A007511 A016032 * A083939 A083941 A080263
KEYWORD
nonn
AUTHOR
Antti Karttunen, Mar 02 2003
STATUS
approved

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Last modified March 28 05:39 EDT 2024. Contains 371235 sequences. (Running on oeis4.)