639760

Appears in sequences

• T(n,k)=Number of lower triangles of an (n+2k-2)X(n+2k-2) 0..k array with new values introduced in row major order 0..k and no element unequal to more than one horizontal or vertical neighbor.at n=28A194778
• Number of lower triangles of a (2n-1)X(2n-1) 0..n array with new values introduced in row major order 0..n and no element unequal to more than one horizontal or vertical neighbor.at n=7A194779