Number of lower triangles of an n X n 0..3 array with new values introduced in row major order 0..3 and no element equal to more than two horizontal or vertical neighbors.
A194571
Number of lower triangles of an n X n 0..3 array with new values introduced in row major order 0..3 and no element equal to more than two horizontal or vertical neighbors.
Terms
- a(0) =1a(1) =5a(2) =178a(3) =39317a(4) =35539864a(5) =123214409287
External references
- oeis: A194571