Number of 4Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, with no 2-loops and with no occupancy greater than 2.
A221390
Number of 4Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, with no 2-loops and with no occupancy greater than 2.
Terms
- a(0) =0a(1) =0a(2) =13a(3) =1198a(4) =52320a(5) =2204556a(6) =86673898a(7) =3361458245a(8) =128992693561
External references
- oeis: A221390