T(n,k)=Number of (n+1)X(n+1) 0..k arrays with diagonal zero and the i,j-th 2X2 subblock sum equal to the j,i-th 2X2 subblock sum.

A187408

T(n,k)=Number of (n+1)X(n+1) 0..k arrays with diagonal zero and the i,j-th 2X2 subblock sum equal to the j,i-th 2X2 subblock sum.

Terms

    a(0) =4a(1) =9a(2) =20a(3) =16a(4) =141a(5) =152a(6) =25a(7) =580a(8) =4743a(9) =1984a(10) =36a(11) =1751a(12) =59008a(13) =378999a(14) =50176a(15) =49a(16) =4332a(17) =426425a(18) =18555136a(19) =77470101a(20) =2677760a(21) =64a(22) =9331a(23) =2164680a(24) =397056235a(25) =19210448896a(26) =43182942669a(27) =306864128a(28) =81a(29) =18152

External references