T(n,k)=Number of nXk 0..3 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor.
A201625
T(n,k)=Number of nXk 0..3 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor.
Terms
- a(0) =0a(1) =4a(2) =4a(3) =4a(4) =16a(5) =4a(6) =10a(7) =56a(8) =56a(9) =10a(10) =16a(11) =211a(12) =378a(13) =211a(14) =16a(15) =26a(16) =718a(17) =3699a(18) =3699a(19) =718a(20) =26a(21) =40a(22) =2271a(23) =31802a(24) =91223a(25) =31802a(26) =2271a(27) =40a(28) =59a(29) =6654
External references
- oeis: A201625