OFFSET
0,2
LINKS
Eric Weisstein's World of Mathematics, Jacobi Theta Functions
FORMULA
G.f.: g(g(x) - 1), where g(x) = g.f. of A015128.
MATHEMATICA
nmax = 23; CoefficientList[Series[1/EllipticTheta[4, 0, 1/EllipticTheta[4, 0, x] - 1], {x, 0, nmax}], x]
g[x_] := g[x] = Product[(1 + x^k)/(1 - x^k), {k, 1, 23}]; a[n_] := a[n] = SeriesCoefficient[g[g[x] - 1], {x, 0, n}]; Table[a[n], {n, 0, 23}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Apr 12 2019
STATUS
approved