Number of n X n 0..2 arrays with top left element 0, horizontal differences mod 3 never 1, vertical differences mod 3 never -1, and antidiagonal differences never 0.
A229396
Number of n X n 0..2 arrays with top left element 0, horizontal differences mod 3 never 1, vertical differences mod 3 never -1, and antidiagonal differences never 0.
Terms
- a(0) =1a(1) =5a(2) =44a(3) =711a(4) =21464a(5) =1220881a(6) =131393852a(7) =26816872052
External references
- oeis: A229396