T(n,k) = number of (n+1)X(k+1) 0..3 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing x(i,j)-x(i-1,j) in the j direction.
A250544
T(n,k) = number of (n+1)X(k+1) 0..3 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing x(i,j)-x(i-1,j) in the j direction.
Terms
- a(0) =150a(1) =1080a(2) =1080a(3) =6627a(4) =10704a(5) =6627a(6) =36552a(7) =79366a(8) =79366a(9) =36552a(10) =187000a(11) =491650a(12) =644779a(13) =491650a(14) =187000a(15) =905440a(16) =2701872a(17) =4169584a(18) =4169584a(19) =2701872a(20) =905440a(21) =4206453a(22) =13657024a(23) =23289547a(24) =27240292a(25) =23289547a(26) =13657024a(27) =4206453a(28) =18933408
External references
- oeis: A250544