1429748

Appears in sequences

• 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.at n=4A194570
• T(n,k)=Number of lower triangles of an n X n 0..k array with new values introduced in row major order 0..k and no element equal to more than two horizontal or vertical neighbors.at n=19A194576