Number of (2n+1) X (2n+1) black-and-white mirror-symmetric grids that are legal for crossword puzzles and have no all-black edges.
A325409
Number of (2n+1) X (2n+1) black-and-white mirror-symmetric grids that are legal for crossword puzzles and have no all-black edges.
Terms
- a(0) =1a(1) =2a(2) =20a(3) =269a(4) =8116a(5) =519400a(6) =67566361a(7) =17518353991
External references
- oeis: A325409