OFFSET
0,2
FORMULA
a(0) = 1, a(n) = -(2/n)*Sum_{k=1..n} A096960(k)*a(n-k) for n > 0.
G.f.: exp(Sum_{k>=1} (sigma_5(k) - sigma_5(2*k))*x^k/(16*k)). - Ilya Gutkovskiy, Apr 14 2019
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, Apr 30 2017
STATUS
approved