OFFSET
0,4
FORMULA
G.f.: Sum_{m>0} (m-1)*x^m*(1+2*x^m)/(1-2*x^m)^3. - Vladeta Jovovic, Jun 21 2003
EXAMPLE
a(4) = 1*1*3 + 4*2*1 + 16*8*0 = 11.
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jun 13 2003
STATUS
approved