893760domain: NAppears in sequencesa(n) = (n - 1)*(n^3 + 1) = n^4 - n^3 + n - 1, for n >= 1.at n=30A242604Number of 2 X 2 matrices with entries in {0,1,...,n} and odd determinant with no entry repeated.at n=40A279483Values of Euler's totient phi for A050498.at n=20A339883