OFFSET
0,5
COMMENTS
Convolution inverse of the 3rd order mock theta function phi(q) (A053250).
LINKS
Eric Weisstein's World of Mathematics, Mock Theta Function
FORMULA
G.f.: 1/(1 + Sum_{i>=1} q^(i^2)/Product_{j=1..i} (1 + q^(2*j))).
MATHEMATICA
nmax = 50; CoefficientList[Series[1/(1 + Sum[q^(i^2)/Product[1 + q^(2 j), {j, 1, i}], {i, 1, nmax}]), {q, 0, nmax}], q]
CROSSREFS
KEYWORD
sign
AUTHOR
Ilya Gutkovskiy, Oct 30 2017
STATUS
approved