A320544 - cp's OEIS frontend

A320544 (1/8) * number of ways to select 3 distinct points forming a triangle of unsigned area = 1 from a square of grid points with side length n.

n	a(n)
1	0
2	4
3	18
4	53
5	119
6	234
7	413
8	681
9	1047
10	1562
11	2243
12	3101
13	4186
14	5576
15	7231
16	9243
17	11652
18	14518
19	17886
20	21779
21	26191
22	31368
23	37285
24	43919
25	51364
26	59894
27	69338
28	79831
29	91495
30	104336
31	118513
32	134135
33	151072
34	169878
35	190229
36	212185
37	236040
38	262244
39	290317
40	320487

[0, 4, 18, 53, 119, 234, 413, 681, 1047, 1562, 2243, 3101, 4186, 5576, 7231, 9243, 11652, 14518, 17886, 21779, 26191, 31368, 37285, 43919, 51364, 59894, 69338, 79831, 91495, 104336, 118513, 134135, 151072, 169878, 190229, 212185, 236040, 262244, 290317, 320487]

cp's OEIS Frontend

A320544 (1/8) * number of ways to select 3 distinct points forming a triangle of unsigned area = 1 from a square of grid points with side length n.

Table of values

List of values