OFFSET
0,2
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
J. Pasukonis, S. Ramgoolam, From counting to construction for BPS states in N=4SYM, arXiv:1010.1683 [hep-th], 2010, (E.4).
J. Pasukonis, S. Ramgoolam, From counting to construction for BPS states in N=4SYM, J. High En. Phys. 2011 (2) (2011), (E.4).
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, 4], {n, 0, 12}] (* Wouter Meeussen, Dec 06 2008 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
R. J. Mathar, Jul 11 2008
STATUS
approved