A386560 - cp's OEIS frontend

A386560 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 finite regions created in the resulting graph.

n	a(n)
1	4
2	72
3	424
4	1396
5	3536
6	7292
7	14272
8	24332
9	39356
10	59920
11	91348
12	128084
13	182664
14	245804
15	323116
16	418552
17	547820
18	684680
19	869388
20	1060892
21	1289564
22	1560920

[4, 72, 424, 1396, 3536, 7292, 14272, 24332, 39356, 59920, 91348, 128084, 182664, 245804, 323116, 418552, 547820, 684680, 869388, 1060892, 1289564, 1560920]

cp's OEIS Frontend

A386560 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 finite regions created in the resulting graph.

Table of values

List of values