Number of nX3 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.
A203970
Number of nX3 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) =4a(1) =29a(2) =258a(3) =2061a(4) =16723a(5) =136243a(6) =1107082a(7) =9001543a(8) =73188575a(9) =595039791a(10) =4837958263a(11) =39334611930a(12) =319806460796
External references
- oeis: A203970