Number of nX2 0..4 arrays with values 0..4 introduced in row major order and each element equal to at least one horizontal or vertical neighbor.
A198702
Number of nX2 0..4 arrays with values 0..4 introduced in row major order and each element equal to at least one horizontal or vertical neighbor.
Terms
- a(0) =1a(1) =3a(2) =14a(3) =76a(4) =488a(5) =3508a(6) =27422a(7) =227045a(8) =1950662a(9) =17146596a(10) =152812056a(11) =1373072354a(12) =12397256874a(13) =112250461201
External references
- oeis: A198702