39976960

Appears in sequences

• a(n) = -2*a(n-1) + 4*a(n-2), a(0) = 1, a(1) = 0.at n=16A086344
• a(n) = 2*a(n-1) + 4*a(n-2) with n>1, a(0)=0, a(1)=4.at n=15A209084
• Number of (4+2) X (n+2) 0..3 arrays with every 3 X 3 subblock row and diagonal sum equal to 0 2 3 6 or 7 and every 3 X 3 column and antidiagonal sum not equal to 0 2 3 6 or 7.at n=26A252536