1268624domain: NAppears in sequencesExpansion of Product_{i>=1, j>=0} (1 + x^(i*2^j)) / (1 - x^(i*2^j)).at n=27A327727Expansion of (1+x-2*x^2-2*x^3) / (1-6*x^2-4*x^3+2*x^4).at n=15A384633