-24590domain: ZAppears in sequencesa(0) = 1, a(1) = 0, a(2) = -1; for n >= 3, a(n) = - a(n-2) + Sum_{ primes p with 3 <= p <= n} a(n-p).at n=65A002121Expansion of Product_{k>=1} ((1 - x)^k - x^k)/((1 - x)^k + x^k).at n=17A307520