A192024 - cp's OEIS frontend

A192024 Triangle read by rows: T(n,k) is the number of unordered pairs of nodes at distance k in the double-comb graph \/\/\/...\/_\/ with 3n (n>=1) nodes. The entries in row n are the coefficients of the corresponding Wiener polynomial.

n	a(n)
1	2
2	1
3	5
4	6
5	4
6	8
7	12
8	12
9	4
10	11
11	18
12	21
13	12
14	4
15	14
16	24
17	30
18	21
19	12
20	4
21	17
22	30
23	39
24	30
25	21
26	12
27	4
28	20
29	36
30	48
31	39
32	30
33	21
34	12
35	4
36	23
37	42
38	57
39	48
40	39
41	30
42	21
43	12
44	4
45	26
46	48
47	66
48	57
49	48
50	39
51	30
52	21
53	12
54	4
55	29
56	54
57	75
58	66
59	57
60	48
61	39
62	30
63	21
64	12
65	4
66	32
67	60
68	84
69	75
70	66
71	57
72	48
73	39
74	30
75	21
76	12
77	4

[2, 1, 5, 6, 4, 8, 12, 12, 4, 11, 18, 21, 12, 4, 14, 24, 30, 21, 12, 4, 17, 30, 39, 30, 21, 12, 4, 20, 36, 48, 39, 30, 21, 12, 4, 23, 42, 57, 48, 39, 30, 21, 12, 4, 26, 48, 66, 57, 48, 39, 30, 21, 12, 4, 29, 54, 75, 66, 57, 48, 39, 30, 21, 12, 4, 32, 60, 84, 75, 66, 57, 48, 39, 30, 21, 12, 4]

cp's OEIS Frontend

A192024 Triangle read by rows: T(n,k) is the number of unordered pairs of nodes at distance k in the double-comb graph \/\/\/...\/_\/ with 3n (n>=1) nodes. The entries in row n are the coefficients of the corresponding Wiener polynomial.

Table of values

List of values

n	a(n)
1	2
2	1
3	5
4	6
5	4
6	8
7	12
8	12
9	4
10	11
11	18
12	21
13	12
14	4
15	14
16	24
17	30
18	21
19	12
20	4
21	17
22	30
23	39
24	30
25	21
26	12
27	4
28	20
29	36
30	48
31	39
32	30
33	21
34	12
35	4
36	23
37	42
38	57
39	48
40	39
41	30
42	21
43	12
44	4
45	26
46	48
47	66
48	57
49	48
50	39
51	30
52	21
53	12
54	4
55	29
56	54
57	75
58	66
59	57
60	48
61	39
62	30
63	21
64	12
65	4
66	32
67	60
68	84
69	75
70	66
71	57
72	48
73	39
74	30
75	21
76	12
77	4

n	a(n)
1	2
2	1
3	5
4	6
5	4
6	8
7	12
8	12
9	4
10	11
11	18
12	21
13	12
14	4
15	14
16	24
17	30
18	21
19	12
20	4
21	17
22	30
23	39
24	30
25	21
26	12
27	4
28	20
29	36
30	48
31	39
32	30
33	21
34	12
35	4
36	23
37	42
38	57
39	48
40	39
41	30
42	21
43	12
44	4
45	26
46	48
47	66
48	57
49	48
50	39
51	30
52	21
53	12
54	4
55	29
56	54
57	75
58	66
59	57
60	48
61	39
62	30
63	21
64	12
65	4
66	32
67	60
68	84
69	75
70	66
71	57
72	48
73	39
74	30
75	21
76	12
77	4

n	a(n)
1	2
2	1
3	5
4	6
5	4
6	8
7	12
8	12
9	4
10	11
11	18
12	21
13	12
14	4
15	14
16	24
17	30
18	21
19	12
20	4
21	17
22	30
23	39
24	30
25	21
26	12
27	4
28	20
29	36
30	48
31	39
32	30
33	21
34	12
35	4
36	23
37	42
38	57
39	48
40	39
41	30
42	21
43	12
44	4
45	26
46	48
47	66
48	57
49	48
50	39
51	30
52	21
53	12
54	4
55	29
56	54
57	75
58	66
59	57
60	48
61	39
62	30
63	21
64	12
65	4
66	32
67	60
68	84
69	75
70	66
71	57
72	48
73	39
74	30
75	21
76	12
77	4