435834100000domain: NAppears in sequencesa(n) = Product_{i=1..n} (i^2 + 1).at n=9A101686a(n) = (1^2 + 1)*(2^2 + 1)*(3^2 + 1)*...*(((prime(n) - 1)/2)^2 + 1).at n=6A228120