T(n,k)=1/4 the number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock having at least two equal elements connected horizontally or vertically.

A184153

T(n,k)=1/4 the number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock having at least two equal elements connected horizontally or vertically.

Terms

    a(0) =43a(1) =499a(2) =499a(3) =5695a(4) =17203a(5) =5695a(6) =65227a(7) =584143a(8) =584143a(9) =65227a(10) =746503a(11) =19882711a(12) =58656073a(13) =19882711a(14) =746503a(15) =8544883a(16) =676507975a(17) =5910714349a(18) =5910714349a(19) =676507975a(20) =8544883a(21) =97806031a(22) =23019453235a(23) =595270788529

External references