OFFSET
0,4
FORMULA
a(n) appears to be asymptotic to A*B^n where A=0.666953457161016631166386... B=1.47202915703312788636092648...
MATHEMATICA
nmax = 50; CoefficientList[Series[-1/x - 1/(1 - Product[1 - (-x)^k, {k, 1, nmax}]), {x, 0, nmax}], x] (* Vaclav Kotesovec, May 25 2020 *)
PROG
(PARI) a(n)=(-1)^n*polcoeff(1/x-1/(1-eta(x))+O(x^n), n)
CROSSREFS
KEYWORD
nonn
AUTHOR
Benoit Cloitre, May 01 2003
STATUS
approved