T(n,k)=Half the number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock diagonal sum differing from its antidiagonal sum by more than 3.

A184231

T(n,k)=Half the number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock diagonal sum differing from its antidiagonal sum by more than 3.

Terms

    a(0) =15a(1) =57a(2) =57a(3) =180a(4) =411a(5) =180a(6) =621a(7) =2318a(8) =2318a(9) =621a(10) =2061a(11) =14641a(12) =20958a(13) =14641a(14) =2061a(15) =6966a(16) =88103a(17) =224156a(18) =224156a(19) =88103a(20) =6966a(21) =23355a(22) =541936a(23) =2227254a(24) =4207437a(25) =2227254a(26) =541936a(27) =23355a(28) =78597a(29) =3302001

External references