Number of nX2 0..4 arrays with values 0..4 introduced in row major order and each element equal to one or two horizontal and vertical neighbors.
A198663
Number of nX2 0..4 arrays with values 0..4 introduced in row major order and each element equal to one or two horizontal and vertical neighbors.
Terms
- a(0) =1a(1) =3a(2) =13a(3) =65a(4) =401a(5) =2798a(6) =21243a(7) =170477a(8) =1414186a(9) =11959573a(10) =102256003a(11) =879709138a(12) =7594221063a(13) =65683697809a(14) =568711886538
External references
- oeis: A198663