Number of nX7 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.
A203180
Number of nX7 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) =5a(1) =18a(2) =235a(3) =2466a(4) =23083a(5) =223567a(6) =2208945a(7) =22411843a(8) =216858412a(9) =2141041521a(10) =21294389765a(11) =209517628754
External references
- oeis: A203180