A320539 - cp's OEIS frontend

A320539 (1/2) * number of ways to select 3 distinct collinear points from a rectangle of grid points with side lengths j and k, written as triangle T(j,k), j<=k.

n	a(n)
1	0
2	1
3	4
4	4
5	10
6	22
7	10
8	21
9	42
10	76
11	20
12	39
13	70
14	120
15	186
16	35
17	65
18	112
19	184
20	279
21	412
22	56
23	100
24	166
25	264
26	390
27	566
28	772
29	84
30	146
31	236
32	367
33	532
34	759
35	1026
36	1356
37	120
38	205
39	324
40	494
41	704
42	991
43	1326
44	1740
45	2224
46	165
47	278
48	432
49	647
50	913
51	1271
52	1686
53	2196
54	2793
55	3496

[0, 1, 4, 4, 10, 22, 10, 21, 42, 76, 20, 39, 70, 120, 186, 35, 65, 112, 184, 279, 412, 56, 100, 166, 264, 390, 566, 772, 84, 146, 236, 367, 532, 759, 1026, 1356, 120, 205, 324, 494, 704, 991, 1326, 1740, 2224, 165, 278, 432, 647, 913, 1271, 1686, 2196, 2793, 3496]

cp's OEIS Frontend

A320539 (1/2) * number of ways to select 3 distinct collinear points from a rectangle of grid points with side lengths j and k, written as triangle T(j,k), j<=k.

Table of values

List of values