T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock having one, three or four distinct values, and new values 0..3 introduced in row major order.

A210134

T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock having one, three or four distinct values, and new values 0..3 introduced in row major order.

Terms

    a(0) =8a(1) =81a(2) =81a(3) =897a(4) =2609a(5) =897a(6) =10019a(7) =84381a(8) =84381a(9) =10019a(10) =111993a(11) =2731088a(12) =7873809a(13) =2731088a(14) =111993a(15) =1251951a(16) =88392872a(17) =735336694a(18) =735336694a(19) =88392872a(20) =1251951a(21) =13995437a(22) =2860882075a(23) =68668190865a(24) =198219480450a(25) =68668190865a(26) =2860882075

External references