Number of n X 3 binary arrays with top left element equal to 1 and no two ones adjacent horizontally or nw-se.
A228791
Number of n X 3 binary arrays with top left element equal to 1 and no two ones adjacent horizontally or nw-se.
Terms
- a(0) =2a(1) =8a(2) =36a(3) =156a(4) =672a(5) =2892a(6) =12444a(7) =53544a(8) =230388a(9) =991308a(10) =4265376a(11) =18352956a(12) =78968652a(13) =339784392a(14) =1462016004a(15) =6290726844a(16) =27067586208a(17) =116465750508a(18) =501125993916
External references
- oeis: A228791