-77530

Appears in sequences

• Array: row n shows the coefficients of the characteristic polynomial of the n-th principal submatrix of {(i+j)*min(i,j)} (A203990).at n=21A203991
• a(n) = 2^n * Sum_{k=0..n} k^p*q^k, where p=2, q=-1/2.at n=20A232603