63624960

Appears in sequences

• Fourier 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=20A323991
• Number of ways that people can sit in n linearly arranged seats such that there are two or three empty seats between any two persons, zero, one or two empty seats at the start and end, and at least one person gets seated.at n=27A373783