Number of n X n 0..2 arrays avoiding 11 horizontally, 22 vertically and 00 diagonally or antidiagonally.
A229373
Number of n X n 0..2 arrays avoiding 11 horizontally, 22 vertically and 00 diagonally or antidiagonally.
Terms
- a(0) =3a(1) =30a(2) =956a(3) =78690a(4) =20014278a(5) =13999334726
External references
- oeis: A229373