T(n,k)=Number of (n+2)X(k+2) 0..4 arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order.

A186096

T(n,k)=Number of (n+2)X(k+2) 0..4 arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order.

Terms

    a(0) =102251a(1) =1252889a(2) =1252889a(3) =11258613a(4) =22559052a(5) =11258613a(6) =83378583a(7) =280102672a(8) =280102672a(9) =83378583a(10) =531218757a(11) =2743553694a(12) =4527262140a(13) =2743553694a(14) =531218757a(15) =2985984444a(16) =22408644868a(17) =55707179395a(18) =55707179395a(19) =22408644868a(20) =2985984444

External references