(1/4) * number of ways to select 3 distinct collinear points from a square of grid points with side length n.

A320540

(1/4) * number of ways to select 3 distinct collinear points from a square of grid points with side length n.

Terms

    a(0) =0a(1) =2a(2) =11a(3) =38a(4) =93a(5) =206a(6) =386a(7) =678a(8) =1112a(9) =1748a(10) =2583a(11) =3768a(12) =5253a(13) =7172a(14) =9630a(15) =12720a(16) =16370a(17) =20910a(18) =26169a(19) =32566a(20) =40139a(21) =48962a(22) =58900a(23) =70710a(24) =84096a(25) =99284a(26) =116469a(27) =136116a(28) =157671a(29) =182436

External references