Number of nX3 0..1 arrays with every element equal to 0, 1, 2, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
A303011
Number of nX3 0..1 arrays with every element equal to 0, 1, 2, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =4a(1) =20a(2) =68a(3) =308a(4) =1320a(5) =5220a(6) =22652a(7) =95220a(8) =390580a(9) =1662564a(10) =6961252a(11) =28957492a(12) =122178532a(13) =511463444a(14) =2138409476a(15) =8987766644a(16) =37641997156a(17) =157656704660a(18) =661559870852
External references
- oeis: A303011