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A014281 Number of trees on n nodes with forbidden limbs. 0
0, 1, 1, 1, 1, 2, 3, 4, 9, 18, 40, 84, 189, 425, 986, 2298, 5465, 13072, 31661, 77173, 189697, 468969, 1166720, 2916983, 7329321, 18494428, 46859177, 119161865, 304076055, 778399130, 1998552928, 5145515877, 13282204144, 34368982552, 89136810772 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,6

LINKS

Table of n, a(n) for n=0..34.

T. Lu, The enumeration of trees with and without given limbs, Discr. Math., 154 (1996), 153-165.

Index entries for sequences related to trees

FORMULA

G.f. x^5+x^6 +g014280(x) -(g014280(x)^2 - g014280(x^2) )/2, where g015280 is the o.g.f. of A014280. - R. J. Mathar, Feb 27 2016

CROSSREFS

Sequence in context: A088275 A274836 A322783 * A220364 A243902 A086865

Adjacent sequences:  A014278 A014279 A014280 * A014282 A014283 A014284

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified July 18 21:25 EDT 2019. Contains 325144 sequences. (Running on oeis4.)