Number of nX3 0..3 arrays with values 0..3 introduced in row major order, the number of instances of each value within one of each other, and every element equal to zero or two horizontal or vertical neighbors.
A199196
Number of nX3 0..3 arrays with values 0..3 introduced in row major order, the number of instances of each value within one of each other, and every element equal to zero or two horizontal or vertical neighbors.
Terms
- a(0) =1a(1) =14a(2) =114a(3) =447a(4) =17598a(5) =342958a(6) =3366282a(7) =13445925a(8) =707828355a(9) =15468414047a(10) =160870584083a(11) =660014693614
External references
- oeis: A199196