A285490 - cp's OEIS frontend

A285490 Lexicographically earliest sequence such that no two distinct, unordered pairs of distinct points ((n, a(n)), (m, a(m))) and ((k, a(k)), (j, a(j))) have the same midpoint.

n	a(n)
1	1
2	1
3	1
4	2
5	1
6	3
7	5
8	1
9	7
10	4
11	9
12	12
13	1
14	17
15	21
16	28
17	6
18	27
19	2
20	16
21	14
22	22
23	41
24	1
25	50
26	11
27	33
28	61
29	9
30	4
31	73
32	58
33	88
34	97
35	40
36	2
37	26
38	19
39	95
40	82
41	45
42	15
43	1
44	96
45	54
46	66
47	125
48	143
49	57
50	138
51	10
52	1
53	171
54	92
55	184
56	178
57	191
58	54
59	110
60	160
61	13
62	3
63	202
64	217
65	122
66	88
67	42

[1, 1, 1, 2, 1, 3, 5, 1, 7, 4, 9, 12, 1, 17, 21, 28, 6, 27, 2, 16, 14, 22, 41, 1, 50, 11, 33, 61, 9, 4, 73, 58, 88, 97, 40, 2, 26, 19, 95, 82, 45, 15, 1, 96, 54, 66, 125, 143, 57, 138, 10, 1, 171, 92, 184, 178, 191, 54, 110, 160, 13, 3, 202, 217, 122, 88, 42]

cp's OEIS Frontend

A285490 Lexicographically earliest sequence such that no two distinct, unordered pairs of distinct points ((n, a(n)), (m, a(m))) and ((k, a(k)), (j, a(j))) have the same midpoint.

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	2
5	1
6	3
7	5
8	1
9	7
10	4
11	9
12	12
13	1
14	17
15	21
16	28
17	6
18	27
19	2
20	16
21	14
22	22
23	41
24	1
25	50
26	11
27	33
28	61
29	9
30	4
31	73
32	58
33	88
34	97
35	40
36	2
37	26
38	19
39	95
40	82
41	45
42	15
43	1
44	96
45	54
46	66
47	125
48	143
49	57
50	138
51	10
52	1
53	171
54	92
55	184
56	178
57	191
58	54
59	110
60	160
61	13
62	3
63	202
64	217
65	122
66	88
67	42

n	a(n)
1	1
2	1
3	1
4	2
5	1
6	3
7	5
8	1
9	7
10	4
11	9
12	12
13	1
14	17
15	21
16	28
17	6
18	27
19	2
20	16
21	14
22	22
23	41
24	1
25	50
26	11
27	33
28	61
29	9
30	4
31	73
32	58
33	88
34	97
35	40
36	2
37	26
38	19
39	95
40	82
41	45
42	15
43	1
44	96
45	54
46	66
47	125
48	143
49	57
50	138
51	10
52	1
53	171
54	92
55	184
56	178
57	191
58	54
59	110
60	160
61	13
62	3
63	202
64	217
65	122
66	88
67	42

n	a(n)
1	1
2	1
3	1
4	2
5	1
6	3
7	5
8	1
9	7
10	4
11	9
12	12
13	1
14	17
15	21
16	28
17	6
18	27
19	2
20	16
21	14
22	22
23	41
24	1
25	50
26	11
27	33
28	61
29	9
30	4
31	73
32	58
33	88
34	97
35	40
36	2
37	26
38	19
39	95
40	82
41	45
42	15
43	1
44	96
45	54
46	66
47	125
48	143
49	57
50	138
51	10
52	1
53	171
54	92
55	184
56	178
57	191
58	54
59	110
60	160
61	13
62	3
63	202
64	217
65	122
66	88
67	42