Number of lower triangles of an n X n 0..2 array with new values introduced in row major order 0..2 and no element equal to more than two horizontal or vertical neighbors.

A194570

Number of lower triangles of an n X n 0..2 array with new values introduced in row major order 0..2 and no element equal to more than two horizontal or vertical neighbors.

Terms

    a(0) =1a(1) =5a(2) =113a(3) =7696a(4) =1429748a(5) =723276072a(6) =996233663484

External references