52255domain: NAppears in sequencesNumber of partitions of n into relatively prime parts. Also aperiodic partitions.at n=42A000837G.f.: 1 / Product_{n>=0} (1 - x^(n+5))^((n+1)*(n+2)*(n+3)*(n+4)/4!).at n=20A264925a(n) = a(n-1) + 3*a(n-2) -2*a(n-3) - 2*a(n-4), where a(0) = -2, a(1) = -2, a(2) = 2, a(3) = 1.at n=19A295854