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 columnwise and nonincreasing rowwise.
A235756
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 columnwise and nonincreasing rowwise.
Terms
- a(0) =81a(1) =498a(2) =498a(3) =2996a(4) =6578a(5) =2996a(6) =15782a(7) =88732a(8) =88732a(9) =15782a(10) =80584a(11) =996868a(12) =2721271a(13) =996868a(14) =80584a(15) =388008a(16) =10878790a(17) =68186440a(18) =68186440a(19) =10878790a(20) =388008a(21) =1819537a(22) =107853469a(23) =1669079300a(24) =3951955004a(25) =1669079300a(26) =107853469a(27) =1819537a(28) =8271237
External references
- oeis: A235756