122740

Appears in sequences

• Number of similarity classes of triangles which can be drawn using the lattice points in an n X n grid for vertices.at n=31A028492
• Principal diagonal of the convolution array A212891.at n=18A213436
• Number of nX5 0..3 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value (x(i,j)+1) mod 4 and at least one element with value (x(i,j)-1) mod 4, no adjacent elements equal, and upper left element zero.at n=7A230828