OFFSET
0,4
LINKS
T. Lu, The enumeration of trees with and without given limbs, Discr. Math., 154 (1996), 153-165, Example 7.
FORMULA
G.f. (x-x^4-x^5-x^6+x^8+x^9+x^10-x^13)/[Product_{p>=1} (1-x^p)^a(p)], implicit form. - R. J. Mathar, Feb 27 2016
MATHEMATICA
nmax = 30; b = ConstantArray[0, nmax+1]; b[[1]] = 0; b[[2]] = 1; Do[b[[n+1]] = SeriesCoefficient[(x-x^4-x^5-x^6+x^8+x^9+x^10-x^13) / Product[(1 - x^p)^(b[[p+1]]), {p, 1, n-1}], {x, 0, n}], {n, 2, nmax}]; b (* Vaclav Kotesovec, Feb 28 2016 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved