Number of (n+1)X(3+1) 0..3 arrays with 2X2 subblock sums lexicographically nondecreasing columnwise and rowwise.
A235260
Number of (n+1)X(3+1) 0..3 arrays with 2X2 subblock sums lexicographically nondecreasing columnwise and rowwise.
Terms
- a(0) =22500a(1) =2691067a(2) =417967682a(3) =41170730836
External references
- oeis: A235260