T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the sum of each 2X2 subblock two median terms lexicographically nondecreasing columnwise and nonincreasing rowwise.
A235752
T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the sum of each 2X2 subblock two median terms lexicographically nondecreasing columnwise and nonincreasing rowwise.
Terms
- a(0) =256a(1) =2648a(2) =2648a(3) =26852a(4) =77708a(5) =26852a(6) =231182a(7) =2349533a(8) =2349533a(9) =231182a(10) =1922672a(11) =57181902a(12) =214506660a(13) =57181902a(14) =1922672a(15) =14817810a(16) =1348418217a(17) =15727633969a(18) =15727633969a(19) =1348418217a(20) =14817810a(21) =110573053a(22) =28136789021
External references
- oeis: A235752