Number of nX2 arrays containing 2 copies of 0..n-1 with no element 1 greater than its north or southwest neighbor modulo n and the upper left element equal to 0.
A266859
Number of nX2 arrays containing 2 copies of 0..n-1 with no element 1 greater than its north or southwest neighbor modulo n and the upper left element equal to 0.
Terms
- a(0) =1a(1) =0a(2) =4a(3) =39a(4) =1281a(5) =67240a(6) =5126572a(7) =531096757a(8) =71602080252
External references
- oeis: A266859