OFFSET
6,4
LINKS
FORMULA
G.f.: (theta_3(x) - 1)^6 / 64, where theta_3() is the Jacobi theta function.
MAPLE
b:= proc(n, t) option remember;
`if`(n=0, `if`(t=0, 1, 0), `if`(t<1, 0, add((s->
`if`(s>n, 0, b(n-s, t-1)))(j^2), j=1..isqrt(n))))
end:
a:= n-> b(n, 6):
seq(a(n), n=6..71); # Alois P. Heinz, Jan 31 2021
MATHEMATICA
nmax = 71; CoefficientList[Series[(EllipticTheta[3, 0, x] - 1)^6/64, {x, 0, nmax}], x] // Drop[#, 6] &
CROSSREFS
KEYWORD
nonn,look
AUTHOR
Ilya Gutkovskiy, Jan 31 2021
STATUS
approved