Number of (n+1)X(3+1) 0..1 arrays with the sum of each 2X2 subblock maximum and minimum lexicographically nondecreasing columnwise and nonincreasing rowwise.
A235731
Number of (n+1)X(3+1) 0..1 arrays with the sum of each 2X2 subblock maximum and minimum lexicographically nondecreasing columnwise and nonincreasing rowwise.
Terms
- a(0) =209a(1) =2481a(2) =29130a(3) =337412a(4) =3906424a(5) =45143913a(6) =521746721a(7) =6028565252a(8) =69659874030a(9) =804890692193
External references
- oeis: A235731