Number of nX3 0..1 arrays with every element equal to 1, 2, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
A303406
Number of nX3 0..1 arrays with every element equal to 1, 2, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =1a(1) =7a(2) =28a(3) =119a(4) =541a(5) =2327a(6) =10384a(7) =47491a(8) =208616a(9) =938105a(10) =4229023a(11) =18855226a(12) =84609455a(13) =379973132a(14) =1700940358a(15) =7627893865a(16) =34215621269a(17) =153337948168a(18) =687522535009
External references
- oeis: A303406