325520

Appears in sequences

• Convolution of nonzero squares A000290 with themselves.at n=23A033455
• Number of closed walks of length n on the complete graph on 6 nodes from a given node.at n=9A109500
• Triangular array read by rows: row n shows the coefficients of the polynomial p(x,n) constructed as in Comments; these polynomials form a strong divisibility sequence.at n=37A327322