Draw a line through every pair of points with coordinates (x, 1) and (x', 2) with x, x' in 1..n, and then count the number of intersection points above the line y = 2.

A092275

Draw a line through every pair of points with coordinates (x, 1) and (x', 2) with x, x' in 1..n, and then count the number of intersection points above the line y = 2.

Terms

    a(0) =0a(1) =2a(2) =11a(3) =29a(4) =69a(5) =125a(6) =224a(7) =361a(8) =563a(9) =809a(10) =1164a(11) =1597a(12) =2188a(13) =2871a(14) =3714a(15) =4701a(16) =5956a(17) =7359a(18) =9099a(19) =11067a(20) =13365a(21) =15879a(22) =18884a(23) =22201a(24) =26056a(25) =30219a(26) =34951a(27) =40117a(28) =46073a(29) =52441

External references