A143937 - cp's OEIS frontend

A143937 Triangle read by rows: T(n,k) is the number of unordered pairs of vertices at distance k in a benzenoid consisting of a linear chain of n hexagons (1 <= k <= 2n+1).

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

[6, 6, 3, 11, 14, 12, 6, 2, 16, 22, 21, 14, 10, 6, 2, 21, 30, 30, 22, 18, 14, 10, 6, 2, 26, 38, 39, 30, 26, 22, 18, 14, 10, 6, 2, 31, 46, 48, 38, 34, 30, 26, 22, 18, 14, 10, 6, 2, 36, 54, 57, 46, 42, 38, 34, 30, 26, 22, 18, 14, 10, 6, 2, 41, 62, 66, 54, 50, 46, 42, 38, 34, 30, 26, 22]

cp's OEIS Frontend

A143937 Triangle read by rows: T(n,k) is the number of unordered pairs of vertices at distance k in a benzenoid consisting of a linear chain of n hexagons (1 <= k <= 2n+1).

Table of values

List of values

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

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

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