116469

Appears in sequences

• Sum of even products minus sum of odd products of different pairs of numbers from 1 to n.at n=35A134449
• (1/4) * number of ways to select 3 distinct collinear points from a square of grid points with side length n.at n=26A320540
• a(n) is the number of 2-point antichains in the poset D_{2n+1} of type D, whose elements are compositions of 2n+1.at n=34A344791