Number of n X n 0..2 arrays with every 1 immediately preceded by 0 to the left or above, no 0 immediately preceded by a 0, and every 2 immediately preceded by 0 1 to the left or above.
A203174
Number of n X n 0..2 arrays with every 1 immediately preceded by 0 to the left or above, no 0 immediately preceded by a 0, and every 2 immediately preceded by 0 1 to the left or above.
Terms
- a(0) =1a(1) =1a(2) =7a(3) =59a(4) =952a(5) =32411a(6) =2208945a(7) =323885934a(8) =84492757788
External references
- oeis: A203174