Number of (n+1)X(2+1) 0..3 arrays with the sum of each 2X2 subblock two extreme terms minus its two median terms lexicographically nondecreasing rowwise and columnwise.
A235557
Number of (n+1)X(2+1) 0..3 arrays with the sum of each 2X2 subblock two extreme terms minus its two median terms lexicographically nondecreasing rowwise and columnwise.
Terms
- a(0) =2612a(1) =86742a(2) =2481481a(3) =58495571a(4) =1190247008a(5) =21374536916a(6) =348532234129
External references
- oeis: A235557