Number of nX3 0..1 arrays with every element equal to 0, 1, 2, 4, 5 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A301486
Number of nX3 0..1 arrays with every element equal to 0, 1, 2, 4, 5 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =4a(1) =18a(2) =52a(3) =148a(4) =441a(5) =1372a(6) =4326a(7) =13641a(8) =42741a(9) =133208a(10) =414303a(11) =1289070a(12) =4015530a(13) =12519594a(14) =39044533a(15) =121754095a(16) =379591807a(17) =1183290025a(18) =3688511653a(19) =11498007929a(20) =35843459506a(21) =111739411177a(22) =348340800464
External references
- oeis: A301486