T(n,k)=1/8 the number of (n+1)X(k+1) 0..3 arrays with all 2X2 subblock sums the same.

Terms

a(0) =32a(1) =88a(2) =88a(3) =242a(4) =204a(5) =242a(6) =748a(7) =491a(8) =491a(9) =748a(10) =2312a(11) =1347a(12) =1052a(13) =1347a(14) =2312a(15) =7684a(16) =3781a(17) =2597a(18) =2597a(19) =3781a(20) =7684a(21) =25538a(22) =11541a(23) =6650a(24) =5802a(25) =6650a(26) =11541a(27) =25538a(28) =89044a(29) =35771