T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the determinants of 2X2 subblocks nondecreasing rightwards and downwards.

A205027

T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the determinants of 2X2 subblocks nondecreasing rightwards and downwards.

Terms

    a(0) =256a(1) =2338a(2) =2338a(3) =15040a(4) =27611a(5) =15040a(6) =84899a(7) =275853a(8) =275853a(9) =84899a(10) =456043a(11) =3684581a(12) =7148335a(13) =3684581a(14) =456043a(15) =2470216a(16) =56088455a(17) =198539736a(18) =198539736a(19) =56088455a(20) =2470216a(21) =13615376a(22) =888172440a(23) =5296848762a(24) =11646996582a(25) =5296848762

External references