OFFSET
0,2
FORMULA
G.f.: Product_{k>=0} 1/(1 - x^(5^k))^2.
MATHEMATICA
nmax = 58; A[_] = 1; Do[A[x_] = A[x^5]/(1 - x)^2 + O[x]^(nmax + 1) // Normal, nmax + 1]; CoefficientList[A[x], x]
nmax = 58; CoefficientList[Series[Product[1/(1 - x^(5^k))^2, {k, 0, Floor[Log[5, nmax]] + 1}], {x, 0, nmax}], x]
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Aug 12 2019
STATUS
approved