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 rowwise and columnwise.
A235815
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 rowwise and columnwise.
Terms
- a(0) =256a(1) =2648a(2) =2648a(3) =26852a(4) =84300a(5) =26852a(6) =231182a(7) =2904651a(8) =2904651a(9) =231182a(10) =1922672a(11) =78133908a(12) =401195649a(13) =78133908a(14) =1922672a(15) =14817810a(16) =2024258650a(17) =40931219364a(18) =40931219364a(19) =2024258650a(20) =14817810a(21) =110573053a(22) =45232185179
External references
- oeis: A235815