T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with every 2X2 subblock sum nondecreasing horizontally, vertically and antidiagonally ne-to-sw.

A253375

T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with every 2X2 subblock sum nondecreasing horizontally, vertically and antidiagonally ne-to-sw.

Terms

    a(0) =81a(1) =450a(2) =450a(3) =2500a(4) =3111a(5) =2500a(6) =11100a(7) =22877a(8) =22631a(9) =11100a(10) =49284a(11) =148389a(12) =219438a(13) =103572a(14) =49284a(15) =192474a(16) =945748a(17) =2000385a(18) =1027387a(19) =521009a(20) =192474a(21) =751689a(22) =5125790a(23) =17316309a(24) =10639450a(25) =5829147a(26) =1977416a(27) =751689a(28) =2707641a(29) =27587386

External references