OFFSET
0,2
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..10000
Eric Weisstein's World of Mathematics, Sum of Squares Function
Eric Weisstein's World of Mathematics, Jacobi Theta Functions
FORMULA
G.f.: theta_3(0,q)^15, where theta_3(x,q) is the third Jacobi theta function.
MATHEMATICA
Table[SquaresR[15, n], {n, 0, 28}]
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Ilya Gutkovskiy, Aug 27 2016
STATUS
approved