A385807 - cp's OEIS frontend

A385807 Number of integer lattice points (x, y) strictly inside a triangle of base 2n - 1 and height n - 1, such that 1 <= x <= 2n - 1, 1 <= y < min(x, 2n - x), and y | x.

n	a(n)
1	0
2	1
3	3
4	6
5	10
6	13
7	18
8	23
9	27
10	32
11	39
12	42
13	50
14	55
15	60
16	67
17	74
18	79
19	87
20	92
21	99
22	106
23	115
24	118
25	128
26	135
27	140
28	149
29	158
30	161
31	172
32	179
33	187
34	194
35	201
36	208
37	219
38	226
39	233
40	240
41	252
42	255
43	268
44	273
45	280
46	293
47	300
48	305
49	316
50	325
51	333
52	340
53	353
54	356
55	367
56	376
57	385
58	394
59	403
60	408
61	424
62	429

[0, 1, 3, 6, 10, 13, 18, 23, 27, 32, 39, 42, 50, 55, 60, 67, 74, 79, 87, 92, 99, 106, 115, 118, 128, 135, 140, 149, 158, 161, 172, 179, 187, 194, 201, 208, 219, 226, 233, 240, 252, 255, 268, 273, 280, 293, 300, 305, 316, 325, 333, 340, 353, 356, 367, 376, 385, 394, 403, 408, 424, 429]

cp's OEIS Frontend

A385807 Number of integer lattice points (x, y) strictly inside a triangle of base 2n - 1 and height n - 1, such that 1 <= x <= 2n - 1, 1 <= y < min(x, 2n - x), and y | x.

Table of values

List of values

n	a(n)
1	0
2	1
3	3
4	6
5	10
6	13
7	18
8	23
9	27
10	32
11	39
12	42
13	50
14	55
15	60
16	67
17	74
18	79
19	87
20	92
21	99
22	106
23	115
24	118
25	128
26	135
27	140
28	149
29	158
30	161
31	172
32	179
33	187
34	194
35	201
36	208
37	219
38	226
39	233
40	240
41	252
42	255
43	268
44	273
45	280
46	293
47	300
48	305
49	316
50	325
51	333
52	340
53	353
54	356
55	367
56	376
57	385
58	394
59	403
60	408
61	424
62	429

n	a(n)
1	0
2	1
3	3
4	6
5	10
6	13
7	18
8	23
9	27
10	32
11	39
12	42
13	50
14	55
15	60
16	67
17	74
18	79
19	87
20	92
21	99
22	106
23	115
24	118
25	128
26	135
27	140
28	149
29	158
30	161
31	172
32	179
33	187
34	194
35	201
36	208
37	219
38	226
39	233
40	240
41	252
42	255
43	268
44	273
45	280
46	293
47	300
48	305
49	316
50	325
51	333
52	340
53	353
54	356
55	367
56	376
57	385
58	394
59	403
60	408
61	424
62	429

n	a(n)
1	0
2	1
3	3
4	6
5	10
6	13
7	18
8	23
9	27
10	32
11	39
12	42
13	50
14	55
15	60
16	67
17	74
18	79
19	87
20	92
21	99
22	106
23	115
24	118
25	128
26	135
27	140
28	149
29	158
30	161
31	172
32	179
33	187
34	194
35	201
36	208
37	219
38	226
39	233
40	240
41	252
42	255
43	268
44	273
45	280
46	293
47	300
48	305
49	316
50	325
51	333
52	340
53	353
54	356
55	367
56	376
57	385
58	394
59	403
60	408
61	424
62	429