OFFSET
0,2
COMMENTS
For n <= 10^4, a(n) = 0 for n = 10, 57, 78, 136, 141.
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..10000
FORMULA
Convolution inverse of A280366.
MAPLE
seq(coeff(series(mul((1-x^(k*(k+1)/2))/(1+x^(k*(k+1)/2)), k=1..n), x, n+1), x, n), n=0..70); # Muniru A Asiru, Jul 14 2018
MATHEMATICA
nmax = 100; CoefficientList[Series[Product[(1 - x^(k*(k+1)/2)) / (1 + x^(k*(k+1)/2)), {k, 1, nmax}], {x, 0, nmax}], x] (* Vaclav Kotesovec, Jul 14 2018 *)
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, Jul 13 2018
STATUS
approved