A192022 - cp's OEIS frontend

A192022 Triangle read by rows: T(n,k) is the number of unordered pairs of nodes at distance k in the comb-shaped graph |||...|_| with 2n (n>=1) nodes. The entries in row n are the coefficients of the corresponding Wiener polynomial.

n	a(n)
1	1
2	0
3	3
4	2
5	1
6	5
7	5
8	4
9	1
10	7
11	8
12	8
13	4
14	1
15	9
16	11
17	12
18	8
19	4
20	1
21	11
22	14
23	16
24	12
25	8
26	4
27	1
28	13
29	17
30	20
31	16
32	12
33	8
34	4
35	1
36	15
37	20
38	24
39	20
40	16
41	12
42	8
43	4
44	1
45	17
46	23
47	28
48	24
49	20
50	16
51	12
52	8
53	4
54	1
55	19
56	26
57	32
58	28
59	24
60	20
61	16
62	12
63	8
64	4
65	1
66	21
67	29
68	36
69	32
70	28
71	24
72	20
73	16
74	12
75	8
76	4
77	1
78	23
79	32
80	40
81	36
82	32
83	28
84	24
85	20
86	16
87	12
88	8
89	4
90	1

[1, 0, 3, 2, 1, 5, 5, 4, 1, 7, 8, 8, 4, 1, 9, 11, 12, 8, 4, 1, 11, 14, 16, 12, 8, 4, 1, 13, 17, 20, 16, 12, 8, 4, 1, 15, 20, 24, 20, 16, 12, 8, 4, 1, 17, 23, 28, 24, 20, 16, 12, 8, 4, 1, 19, 26, 32, 28, 24, 20, 16, 12, 8, 4, 1, 21, 29, 36, 32, 28, 24, 20, 16, 12, 8, 4, 1, 23, 32, 40, 36, 32, 28, 24, 20, 16, 12, 8, 4, 1]

cp's OEIS Frontend

A192022 Triangle read by rows: T(n,k) is the number of unordered pairs of nodes at distance k in the comb-shaped graph |||...|_| with 2n (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	1
2	0
3	3
4	2
5	1
6	5
7	5
8	4
9	1
10	7
11	8
12	8
13	4
14	1
15	9
16	11
17	12
18	8
19	4
20	1
21	11
22	14
23	16
24	12
25	8
26	4
27	1
28	13
29	17
30	20
31	16
32	12
33	8
34	4
35	1
36	15
37	20
38	24
39	20
40	16
41	12
42	8
43	4
44	1
45	17
46	23
47	28
48	24
49	20
50	16
51	12
52	8
53	4
54	1
55	19
56	26
57	32
58	28
59	24
60	20
61	16
62	12
63	8
64	4
65	1
66	21
67	29
68	36
69	32
70	28
71	24
72	20
73	16
74	12
75	8
76	4
77	1
78	23
79	32
80	40
81	36
82	32
83	28
84	24
85	20
86	16
87	12
88	8
89	4
90	1

n	a(n)
1	1
2	0
3	3
4	2
5	1
6	5
7	5
8	4
9	1
10	7
11	8
12	8
13	4
14	1
15	9
16	11
17	12
18	8
19	4
20	1
21	11
22	14
23	16
24	12
25	8
26	4
27	1
28	13
29	17
30	20
31	16
32	12
33	8
34	4
35	1
36	15
37	20
38	24
39	20
40	16
41	12
42	8
43	4
44	1
45	17
46	23
47	28
48	24
49	20
50	16
51	12
52	8
53	4
54	1
55	19
56	26
57	32
58	28
59	24
60	20
61	16
62	12
63	8
64	4
65	1
66	21
67	29
68	36
69	32
70	28
71	24
72	20
73	16
74	12
75	8
76	4
77	1
78	23
79	32
80	40
81	36
82	32
83	28
84	24
85	20
86	16
87	12
88	8
89	4
90	1

n	a(n)
1	1
2	0
3	3
4	2
5	1
6	5
7	5
8	4
9	1
10	7
11	8
12	8
13	4
14	1
15	9
16	11
17	12
18	8
19	4
20	1
21	11
22	14
23	16
24	12
25	8
26	4
27	1
28	13
29	17
30	20
31	16
32	12
33	8
34	4
35	1
36	15
37	20
38	24
39	20
40	16
41	12
42	8
43	4
44	1
45	17
46	23
47	28
48	24
49	20
50	16
51	12
52	8
53	4
54	1
55	19
56	26
57	32
58	28
59	24
60	20
61	16
62	12
63	8
64	4
65	1
66	21
67	29
68	36
69	32
70	28
71	24
72	20
73	16
74	12
75	8
76	4
77	1
78	23
79	32
80	40
81	36
82	32
83	28
84	24
85	20
86	16
87	12
88	8
89	4
90	1