T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with 2X2 subblock sums lexicographically nondecreasing rowwise and nonincreasing columnwise.
A235441
T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with 2X2 subblock sums lexicographically nondecreasing rowwise and nonincreasing columnwise.
Terms
- a(0) =81a(1) =450a(2) =450a(3) =2500a(4) =5295a(5) =2500a(6) =11100a(7) =65497a(8) =65497a(9) =11100a(10) =49284a(11) =606279a(12) =1762344a(13) =606279a(14) =49284a(15) =192474a(16) =5672018a(17) =37115629a(18) =37115629a(19) =5672018a(20) =192474a(21) =751689a(22) =42941705a(23) =785712765a(24) =1957598978a(25) =785712765a(26) =42941705a(27) =751689a(28) =2707641
External references
- oeis: A235441