Number of nX3 0..1 arrays with every element equal to 1, 2, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
A302523
Number of nX3 0..1 arrays with every element equal to 1, 2, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =1a(1) =7a(2) =28a(3) =115a(4) =497a(5) =2086a(6) =9091a(7) =40575a(8) =172996a(9) =760155a(10) =3348129a(11) =14520438a(12) =63606819a(13) =278902951a(14) =1216232548a(15) =5321761651a(16) =23294489377a(17) =101772095142a(18) =445140686771
External references
- oeis: A302523