34974720domain: NAppears in sequencesa(n) = number of elements of order n in Mathieu simple group M_24 of order 244823040.at n=13A146074Fourier coefficients of Eisenstein series of degree 2 and weight 4: a(n) = coefficient of the matrix [n, 1/2; 1/2, 1] with determinant n-1/4.at n=15A323990