T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with 2X2 subblock sums lexicographically nondecreasing columnwise and rowwise.
A235406
T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with 2X2 subblock sums lexicographically nondecreasing columnwise and rowwise.
Terms
- a(0) =81a(1) =450a(2) =450a(3) =2500a(4) =5916a(5) =2500a(6) =11100a(7) =87902a(8) =87902a(9) =11100a(10) =49284a(11) =924132a(12) =4133417a(13) =924132a(14) =49284a(15) =192474a(16) =9730723a(17) =129700247a(18) =129700247a(19) =9730723a(20) =192474a(21) =751689a(22) =80383489a(23) =4053275322a(24) =12449201480a(25) =4053275322a(26) =80383489a(27) =751689a(28) =2707641
External references
- oeis: A235406