T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the upper median of every 2X2 subblock equal.

A237076

T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the upper median of every 2X2 subblock equal.

Terms

    a(0) =256a(1) =2132a(2) =2132a(3) =15882a(4) =51000a(5) =15882a(6) =128988a(7) =1046822a(8) =1046822a(9) =128988a(10) =1042300a(11) =23830240a(12) =53940782a(13) =23830240a(14) =1042300a(15) =8613338a(16) =540277188a(17) =3263989086a(18) =3263989086a(19) =540277188a(20) =8613338a(21) =71747464a(22) =12551185804a(23) =195683299844

External references