OFFSET
0,2
COMMENTS
a(n) is number of nonnegative integer solutions (x,y,z) such that x + y^2 + z^3 = n.
FORMULA
G.f.: (Sum_{i>=0} x^(i^2)) * (Sum_{j>=0} x^(j^3)) / (1-x).
EXAMPLE
a(4) = 5 because there are 5 solutions: (5,0,0), (4,1,0), (4,0,1), (3,1,1) and (1,2,0).
CROSSREFS
KEYWORD
nonn
AUTHOR
Ran Pan, Oct 03 2015
STATUS
approved