A189346 - cp's OEIS frontend

A189346 Number of sets of four points on an n X n grid (or geoboard), exactly three of which are collinear.

n	a(n)
1	0
2	0
3	48
4	532
5	3088
6	11340
7	33824
8	83288
9	183344
10	364304
11	681872
12	1194100
13	1992976
14	3182332
15	4941360
16	7420640
17	10874720
18	15539952
19	21812720
20	30011924
21	40650368
22	54187196
23	71463440
24	92990296
25	119675712
26	152314920
27	192393872
28	240690060

[0, 0, 48, 532, 3088, 11340, 33824, 83288, 183344, 364304, 681872, 1194100, 1992976, 3182332, 4941360, 7420640, 10874720, 15539952, 21812720, 30011924, 40650368, 54187196, 71463440, 92990296, 119675712, 152314920, 192393872, 240690060]

cp's OEIS Frontend

A189346 Number of sets of four points on an n X n grid (or geoboard), exactly three of which are collinear.

Table of values

List of values