1/4 the number of n X 3 0..3 arrays with no element equal both to the element above and to the element to its left.
A185561
1/4 the number of n X 3 0..3 arrays with no element equal both to the element above and to the element to its left.
Terms
- a(0) =16a(1) =900a(2) =50580a(3) =2842560a(4) =159749820a(5) =8977824540a(6) =504547256880
External references
- oeis: A185561