A143939 - cp's OEIS frontend

A143939 Triangle read by rows: T(n,k) is the number of unordered pairs of vertices at distance k in the cycle C_n (1 <= k <= floor(n/2)).

n	a(n)
2	1
3	3
4	4
5	2
6	5
7	5
8	6
9	6
10	3
11	7
12	7
13	7
14	8
15	8
16	8
17	4
18	9
19	9
20	9
21	9
22	10
23	10
24	10
25	10
26	5
27	11
28	11
29	11
30	11
31	11
32	12
33	12
34	12
35	12
36	12
37	6
38	13
39	13
40	13
41	13
42	13
43	13
44	14
45	14
46	14
47	14
48	14
49	14
50	7
51	15
52	15
53	15
54	15
55	15
56	15
57	15
58	16
59	16
60	16
61	16
62	16
63	16
64	16
65	8
66	17
67	17
68	17
69	17
70	17
71	17
72	17
73	17
74	18
75	18
76	18
77	18
78	18
79	18

[1, 3, 4, 2, 5, 5, 6, 6, 3, 7, 7, 7, 8, 8, 8, 4, 9, 9, 9, 9, 10, 10, 10, 10, 5, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 6, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 14, 7, 15, 15, 15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 16, 8, 17, 17, 17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 18]

cp's OEIS Frontend

A143939 Triangle read by rows: T(n,k) is the number of unordered pairs of vertices at distance k in the cycle C_n (1 <= k <= floor(n/2)).

Table of values

List of values

n	a(n)
2	1
3	3
4	4
5	2
6	5
7	5
8	6
9	6
10	3
11	7
12	7
13	7
14	8
15	8
16	8
17	4
18	9
19	9
20	9
21	9
22	10
23	10
24	10
25	10
26	5
27	11
28	11
29	11
30	11
31	11
32	12
33	12
34	12
35	12
36	12
37	6
38	13
39	13
40	13
41	13
42	13
43	13
44	14
45	14
46	14
47	14
48	14
49	14
50	7
51	15
52	15
53	15
54	15
55	15
56	15
57	15
58	16
59	16
60	16
61	16
62	16
63	16
64	16
65	8
66	17
67	17
68	17
69	17
70	17
71	17
72	17
73	17
74	18
75	18
76	18
77	18
78	18
79	18

n	a(n)
2	1
3	3
4	4
5	2
6	5
7	5
8	6
9	6
10	3
11	7
12	7
13	7
14	8
15	8
16	8
17	4
18	9
19	9
20	9
21	9
22	10
23	10
24	10
25	10
26	5
27	11
28	11
29	11
30	11
31	11
32	12
33	12
34	12
35	12
36	12
37	6
38	13
39	13
40	13
41	13
42	13
43	13
44	14
45	14
46	14
47	14
48	14
49	14
50	7
51	15
52	15
53	15
54	15
55	15
56	15
57	15
58	16
59	16
60	16
61	16
62	16
63	16
64	16
65	8
66	17
67	17
68	17
69	17
70	17
71	17
72	17
73	17
74	18
75	18
76	18
77	18
78	18
79	18

n	a(n)
2	1
3	3
4	4
5	2
6	5
7	5
8	6
9	6
10	3
11	7
12	7
13	7
14	8
15	8
16	8
17	4
18	9
19	9
20	9
21	9
22	10
23	10
24	10
25	10
26	5
27	11
28	11
29	11
30	11
31	11
32	12
33	12
34	12
35	12
36	12
37	6
38	13
39	13
40	13
41	13
42	13
43	13
44	14
45	14
46	14
47	14
48	14
49	14
50	7
51	15
52	15
53	15
54	15
55	15
56	15
57	15
58	16
59	16
60	16
61	16
62	16
63	16
64	16
65	8
66	17
67	17
68	17
69	17
70	17
71	17
72	17
73	17
74	18
75	18
76	18
77	18
78	18
79	18