OFFSET
0,2
LINKS
Vaclav Kotesovec, Table of n, a(n) for n = 0..2000
FORMULA
a(n) ~ c * 3^(2*n/3), where
c = 33024.782174678163138510272317... if mod(n,3) = 0
c = 33024.230416953709449028604542... if mod(n,3) = 1
c = 33024.292470246596667257649964... if mod(n,3) = 2.
MATHEMATICA
nmax = 40; CoefficientList[Series[Product[(1 + k^2*x^k)/(1 - k^2*x^k), {k, 1, nmax}], {x, 0, nmax}], x]
CROSSREFS
KEYWORD
nonn
AUTHOR
Vaclav Kotesovec, Dec 16 2015
STATUS
approved