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A014272
Number of trees on n nodes with forbidden limbs.
0
0, 1, 1, 2, 4, 14, 45, 165, 614, 2420, 9782, 40721, 172854, 747625, 3281033, 14588999, 65592358, 297820064, 1363972446, 6295216621, 29256113070, 136814371958, 643430589703, 3041643631339, 14446433252944, 68911476411569, 330030134676707, 1586412426225015, 7651783461702750, 37024499137803700
OFFSET
0,4
FORMULA
G.f. x^3+ g014271(x) -g014271(x)^2, where g014271 is the o.g.f. of A014271. - R. J. Mathar, Feb 27 2016
CROSSREFS
Sequence in context: A121751 A327644 A151355 * A070822 A101536 A149847
KEYWORD
nonn
AUTHOR
STATUS
approved