147692160domain: NAppears in sequencesImaginary part of n!*Sum_{k=1..n} i^(k-1)/k, where i is sqrt(-1).at n=11A282132Fourier coefficients of Eisenstein series of degree 2 and weight 4: a(n) = coefficient of the matrix [n, 0; 0, 1] with determinant n.at n=28A323991