1/6 the number of (n+1)X9 0..2 arrays with every 2X2 subblock containing all three values.
A183602
1/6 the number of (n+1)X9 0..2 arrays with every 2X2 subblock containing all three values.
Terms
- a(0) =209304a(1) =30539367a(2) =3823553752a(3) =495215814566
External references
- oeis: A183602