T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock having the absolute values of all six edge and diagonal differences no larger than 1.

A234161

T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock having the absolute values of all six edge and diagonal differences no larger than 1.

Terms

    a(0) =46a(1) =226a(2) =226a(3) =1108a(4) =2210a(5) =1108a(6) =5446a(7) =21428a(8) =21428a(9) =5446a(10) =26794a(11) =208530a(12) =411712a(13) =208530a(14) =26794a(15) =131896a(16) =2031286a(17) =7952532a(18) =7952532a(19) =2031286a(20) =131896a(21) =649450a(22) =19801468a(23) =153793284a(24) =305867942a(25) =153793284a(26) =19801468a(27) =649450a(28) =3198322

External references