OFFSET
0,2
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
MATHEMATICA
u[0, j_]:=1; u[k_, j_]:=u[k, j]=Sum[Binomial[k-1, i-1]Plus@@(u[k-i, j]#^(i-1)&/@Divisors[j]), {i, k}]; Table[u[n, 6], {n, 0, 12}] [From Wouter Meeussen, Dec 06 2008]
CROSSREFS
KEYWORD
nonn
AUTHOR
R. J. Mathar, Jul 11 2008
STATUS
approved