Number of horizontal, diagonal and antidiagonal neighbor colorings of the even squares of an nX3 array with new integer colors introduced in row major order.
A216457
Number of horizontal, diagonal and antidiagonal neighbor colorings of the even squares of an nX3 array with new integer colors introduced in row major order.
Terms
- a(0) =1a(1) =1a(2) =7a(3) =20a(4) =322a(5) =1335a(6) =36401a(7) =192713a(8) =7712455a(9) =49055292a(10) =2659544320a(11) =19602119017
External references
- oeis: A216457