66963domain: NAppears in sequencesa(n) = A028321(n)/2.at n=33A051473G.f.s of the z^p coefficients of the polynomials in the GF1 denominators of A156921.at n=30A157702a(n) = Sum_{k=0..n} 2^k*p(k), where p(k) is the partition function A000041.at n=10A259400Expansion of Product_{k>=1} 1/((1 - x^k)*(1 - x^(4*k))).at n=38A318027