OFFSET
0,2
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..58
FORMULA
a(n) ~ -2^(n^2 - n + 1). - Vaclav Kotesovec, Apr 25 2018
PROG
(PARI) N=20; x='x+O('x^N); Vec(prod(k=1, N, ((1-(2^k*x)^k)/(1+(2^k*x)^k))^(1/2^k)))
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, Apr 24 2018
STATUS
approved