T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the sum of each 2X2 subblock two median terms lexicographically nondecreasing rowwise and columnwise.
A235531
T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the sum of each 2X2 subblock two median terms lexicographically nondecreasing rowwise and columnwise.
Terms
- a(0) =81a(1) =498a(2) =498a(3) =2996a(4) =6954a(5) =2996a(6) =15782a(7) =102687a(8) =102687a(9) =15782a(10) =80584a(11) =1241251a(12) =4295649a(13) =1241251a(14) =80584a(15) =388008a(16) =14564613a(17) =140614400a(18) =140614400a(19) =14564613a(20) =388008a(21) =1819537a(22) =152335168a(23) =4492923265a(24) =13038576512a(25) =4492923265a(26) =152335168
External references
- oeis: A235531