Number of lower triangles of an n X n 0..1 array with new values introduced in row major order 0..1 and no element equal to more than two horizontal or vertical neighbors.
A194569
Number of lower triangles of an n X n 0..1 array with new values introduced in row major order 0..1 and no element equal to more than two horizontal or vertical neighbors.
Terms
- a(0) =1a(1) =4a(2) =25a(3) =232a(4) =3182a(5) =65372a(6) =1988549a(7) =90079152a(8) =6068358966a(9) =607621801869
External references
- oeis: A194569