294948

Appears in sequences

• Number of (n+1) X (2+1) 0..1 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=15A253429
• Number of polygon edges formed when every pair of vertices of a regular n-gon are joined by an infinite line.at n=35A344899
• Number of polygon edges formed when every pair of vertices of a regular 2n-gon are joined by an infinite line.at n=17A347322