-1912domain: ZAppears in sequencesCoefficient of x^2 in (1+x)^n mod 1+x^4.at n=14A099588Coefficient of x^2 in (1+x)^n mod 1+x^4.at n=15A099588Determinants of 3 X 3 matrices of continuous blocks of 9 consecutive semiprimes.at n=34A118781Alternating sum of octagonal pyramidal numbers.at n=15A269429