1/120 the number of (n+1)X6 0..4 arrays with every 2X2 subblock containing four distinct values.
A183618
1/120 the number of (n+1)X6 0..4 arrays with every 2X2 subblock containing four distinct values.
Terms
- a(0) =1296a(1) =47232a(2) =1724208a(3) =63632480a(4) =2359936032a(5) =87799260864
External references
- oeis: A183618