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 columnwise and nonincreasing rowwise.

A236427

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 columnwise and nonincreasing rowwise.

Terms

    a(0) =81a(1) =487a(2) =487a(3) =2581a(4) =5772a(5) =2581a(6) =12373a(7) =60193a(8) =60193a(9) =12373a(10) =55929a(11) =544380a(12) =1290539a(13) =544380a(14) =55929a(15) =241933a(16) =4505522a(17) =24143945a(18) =24143945a(19) =4505522a(20) =241933a(21) =1015889a(22) =34394854a(23) =414682711a(24) =987221751a(25) =414682711a(26) =34394854a(27) =1015889a(28) =4174941

External references