login
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
OFFSET
0,6
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
KEYWORD
nonn
AUTHOR
STATUS
approved