289044

Appears in sequences

• Number of polygons formed when every pair of vertices of a regular n-gon are joined by an infinite line.at n=41A344857
• A344857(2*n).at n=20A347320
• a(n) is the number of 2 X 2 matrices with elements 1..n where at least one row, at least one column and at least one of the two diagonals is strictly increasing.at n=28A391092