Number of nX3 0..1 arrays with every element equal to 0, 1, 2, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
A303177
Number of nX3 0..1 arrays with every element equal to 0, 1, 2, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =4a(1) =17a(2) =31a(3) =135a(4) =547a(5) =1938a(6) =6965a(7) =25953a(8) =95602a(9) =350544a(10) =1288829a(11) =4742540a(12) =17436564a(13) =64107857a(14) =235741082a(15) =866860297a(16) =3187480223a(17) =11720639783a(18) =43098018497a(19) =158475393298a(20) =582728318557
External references
- oeis: A303177