21553018

Appears in sequences

• a(n) = 9*a(n-1) - 7*a(n-2), with a(0)=0, a(1)=1.at n=9A190984
• Number of (n+1) X (7+1) 0..2 arrays with no 2 X 2 subblock having its maximum diagonal element less than its minimum antidiagonal element.at n=0A250912
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with no 2X2 subblock having its maximum diagonal element less than its minimum antidiagonal element.at n=21A250913