T(n,k) is the number of (n+1) X (k+1) 0..4 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 5 (constant-stress 1 X 1 tilings).
A235280
T(n,k) is the number of (n+1) X (k+1) 0..4 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 5 (constant-stress 1 X 1 tilings).
Terms
- a(0) =40a(1) =100a(2) =100a(3) =208a(4) =208a(5) =208a(6) =520a(7) =380a(8) =380a(9) =520a(10) =1120a(11) =844a(12) =632a(13) =844a(14) =1120a(15) =2800a(16) =1660a(17) =1280a(18) =1280a(19) =1660a(20) =2800a(21) =6208a(22) =3844a(23) =2344a(24) =2344a(25) =2344a(26) =3844a(27) =6208a(28) =15520a(29) =8012
External references
- oeis: A235280