85950

Appears in sequences

• a(n) = Sum_{k=1..n-1} k^2*sigma(k)*sigma(n-k).at n=14A000477
• Triangle T(n,k) read by rows, where T(n,k) = number of times the permanent of a real singular n X n (0,1)-matrix takes the value k, for n >= 2, 0 <= k <= n!.at n=55A089481
• Number of (n+2)X3 0..2 arrays with each 3X3 subblock having a positive determinant.at n=1A186064
• Number of (n+2)X4 0..2 arrays with each 3X3 subblock having a positive determinant.at n=0A186065
• T(n,k) = Number of (n+2) X (k+2) 0..2 arrays with each 3 X 3 subblock having a positive determinant.at n=1A186068
• T(n,k) = Number of (n+2) X (k+2) 0..2 arrays with each 3 X 3 subblock having a positive determinant.at n=2A186068