Number of lower triangles of an n X n 0..4 array with new values introduced in row major order 0..4 and no element equal to more than two horizontal or vertical neighbors.
A194572
Number of lower triangles of an n X n 0..4 array with new values introduced in row major order 0..4 and no element equal to more than two horizontal or vertical neighbors.
Terms
- a(0) =1a(1) =5a(2) =193a(3) =80780a(4) =225623340
External references
- oeis: A194572