Place a point on the integer coordinates, up to |n|, along all four axial directions on a Cartesian plane, and then join an infinite straight line between every pair of points: a(n) is the number of points where lines intersect in the resulting graph.
A386559
Place a point on the integer coordinates, up to |n|, along all four axial directions on a Cartesian plane, and then join an infinite straight line between every pair of points: a(n) is the number of points where lines intersect in the resulting graph.
Terms
- a(0) =5a(1) =65a(2) =381a(3) =1213a(4) =3033a(5) =6105a(6) =12285a(7) =20789a(8) =33705a(9) =51065a(10) =79797a(11) =110817a(12) =161549a(13) =216985a(14) =284269a(15) =367925a(16) =489953a(17) =609225a(18) =785045a(19) =952877a(20) =1157749a(21) =1404473
External references
- oeis: A386559