Number of nX4 0..2 arrays with every 1 immediately preceded by 0 to the left or above, and every 2 immediately preceded by 0 1 to the left or above.
A203971
Number of nX4 0..2 arrays with every 1 immediately preceded by 0 to the left or above, and every 2 immediately preceded by 0 1 to the left or above.
Terms
- a(0) =7a(1) =106a(2) =2061a(3) =34799a(4) =601521a(5) =10443081a(6) =180623180a(7) =3127443494a(8) =54147787428a(9) =937401735877
External references
- oeis: A203971