A274462 - cp's OEIS frontend

A274462 Place n equally-spaced points around a circle, labeled 0,1,2,...,n-1. For each i = 0..n-1 such that 4i != i mod n, draw an (undirected) chord from i to (4i mod n). Then a(n) is the total number of distinct chords.

n	a(n)
0	0
1	0
2	1
3	0
4	3
5	2
6	3
7	6
8	7
9	6
10	7
11	10
12	9
13	12
14	13
15	6
16	15
17	16
18	15
19	18
20	17
21	18
22	21
23	22
24	21
25	22
26	25
27	24
28	27
29	28
30	21
31	30
32	31
33	30
34	33
35	32
36	33
37	36
38	37
39	36
40	37
41	40
42	39
43	42
44	43
45	36
46	45
47	46
48	45
49	48
50	47
51	48
52	51
53	52
54	51
55	52
56	55
57	54
58	57
59	58
60	51

[0, 0, 1, 0, 3, 2, 3, 6, 7, 6, 7, 10, 9, 12, 13, 6, 15, 16, 15, 18, 17, 18, 21, 22, 21, 22, 25, 24, 27, 28, 21, 30, 31, 30, 33, 32, 33, 36, 37, 36, 37, 40, 39, 42, 43, 36, 45, 46, 45, 48, 47, 48, 51, 52, 51, 52, 55, 54, 57, 58, 51]

cp's OEIS Frontend

A274462 Place n equally-spaced points around a circle, labeled 0,1,2,...,n-1. For each i = 0..n-1 such that 4i != i mod n, draw an (undirected) chord from i to (4i mod n). Then a(n) is the total number of distinct chords.

Table of values

List of values

n	a(n)
0	0
1	0
2	1
3	0
4	3
5	2
6	3
7	6
8	7
9	6
10	7
11	10
12	9
13	12
14	13
15	6
16	15
17	16
18	15
19	18
20	17
21	18
22	21
23	22
24	21
25	22
26	25
27	24
28	27
29	28
30	21
31	30
32	31
33	30
34	33
35	32
36	33
37	36
38	37
39	36
40	37
41	40
42	39
43	42
44	43
45	36
46	45
47	46
48	45
49	48
50	47
51	48
52	51
53	52
54	51
55	52
56	55
57	54
58	57
59	58
60	51

n	a(n)
0	0
1	0
2	1
3	0
4	3
5	2
6	3
7	6
8	7
9	6
10	7
11	10
12	9
13	12
14	13
15	6
16	15
17	16
18	15
19	18
20	17
21	18
22	21
23	22
24	21
25	22
26	25
27	24
28	27
29	28
30	21
31	30
32	31
33	30
34	33
35	32
36	33
37	36
38	37
39	36
40	37
41	40
42	39
43	42
44	43
45	36
46	45
47	46
48	45
49	48
50	47
51	48
52	51
53	52
54	51
55	52
56	55
57	54
58	57
59	58
60	51

n	a(n)
0	0
1	0
2	1
3	0
4	3
5	2
6	3
7	6
8	7
9	6
10	7
11	10
12	9
13	12
14	13
15	6
16	15
17	16
18	15
19	18
20	17
21	18
22	21
23	22
24	21
25	22
26	25
27	24
28	27
29	28
30	21
31	30
32	31
33	30
34	33
35	32
36	33
37	36
38	37
39	36
40	37
41	40
42	39
43	42
44	43
45	36
46	45
47	46
48	45
49	48
50	47
51	48
52	51
53	52
54	51
55	52
56	55
57	54
58	57
59	58
60	51