T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the sum of each 2X2 subblock two extreme terms minus its two median terms lexicographically nondecreasing rowwise and columnwise.

A235842

T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the sum of each 2X2 subblock two extreme terms minus its two median terms lexicographically nondecreasing rowwise and columnwise.

Terms

    a(0) =81a(1) =487a(2) =487a(3) =2581a(4) =6921a(5) =2581a(6) =12373a(7) =86509a(8) =86509a(9) =12373a(10) =55929a(11) =919222a(12) =2919508a(13) =919222a(14) =55929a(15) =241933a(16) =8638740a(17) =84434218a(18) =84434218a(19) =8638740a(20) =241933a(21) =1015889a(22) =73276865a(23) =2090202044a(24) =7084268884a(25) =2090202044a(26) =73276865a(27) =1015889a(28) =4174941

External references