A180575 - cp's OEIS frontend

A180575 Triangle read by rows: T(n,k) is the number of unordered pairs of nodes at distance k in the prism graph C_n X P_3 with the edges of the outer cycle removed (called a web graph). Equivalently, the graph is obtained by attaching a pendant edge to each node of the outer cycle of the circular ladder (prism) C_n X P_2. C_n denotes the cycle graph on n nodes and P_n denotes the path graph on n nodes.

n	a(n)
3	12
4	15
5	9
6	16
7	24
8	20
9	6
10	20
11	35
12	35
13	15
14	24
15	42
16	48
17	30
18	9
19	28
20	49
21	63
22	49
23	21
24	32
25	56
26	72
27	64
28	40
29	12
30	36
31	63
32	81
33	81
34	63
35	27
36	40
37	70
38	90
39	90
40	80
41	50
42	15
43	44
44	77
45	99
46	99
47	99
48	77
49	33
50	48
51	84
52	108
53	108
54	108
55	96
56	60
57	18
58	52
59	91
60	117
61	117
62	117
63	117
64	91
65	39
66	56
67	98
68	126
69	126

[12, 15, 9, 16, 24, 20, 6, 20, 35, 35, 15, 24, 42, 48, 30, 9, 28, 49, 63, 49, 21, 32, 56, 72, 64, 40, 12, 36, 63, 81, 81, 63, 27, 40, 70, 90, 90, 80, 50, 15, 44, 77, 99, 99, 99, 77, 33, 48, 84, 108, 108, 108, 96, 60, 18, 52, 91, 117, 117, 117, 117, 91, 39, 56, 98, 126, 126]

cp's OEIS Frontend

Table of values

List of values

n	a(n)
3	12
4	15
5	9
6	16
7	24
8	20
9	6
10	20
11	35
12	35
13	15
14	24
15	42
16	48
17	30
18	9
19	28
20	49
21	63
22	49
23	21
24	32
25	56
26	72
27	64
28	40
29	12
30	36
31	63
32	81
33	81
34	63
35	27
36	40
37	70
38	90
39	90
40	80
41	50
42	15
43	44
44	77
45	99
46	99
47	99
48	77
49	33
50	48
51	84
52	108
53	108
54	108
55	96
56	60
57	18
58	52
59	91
60	117
61	117
62	117
63	117
64	91
65	39
66	56
67	98
68	126
69	126

n	a(n)
3	12
4	15
5	9
6	16
7	24
8	20
9	6
10	20
11	35
12	35
13	15
14	24
15	42
16	48
17	30
18	9
19	28
20	49
21	63
22	49
23	21
24	32
25	56
26	72
27	64
28	40
29	12
30	36
31	63
32	81
33	81
34	63
35	27
36	40
37	70
38	90
39	90
40	80
41	50
42	15
43	44
44	77
45	99
46	99
47	99
48	77
49	33
50	48
51	84
52	108
53	108
54	108
55	96
56	60
57	18
58	52
59	91
60	117
61	117
62	117
63	117
64	91
65	39
66	56
67	98
68	126
69	126

n	a(n)
3	12
4	15
5	9
6	16
7	24
8	20
9	6
10	20
11	35
12	35
13	15
14	24
15	42
16	48
17	30
18	9
19	28
20	49
21	63
22	49
23	21
24	32
25	56
26	72
27	64
28	40
29	12
30	36
31	63
32	81
33	81
34	63
35	27
36	40
37	70
38	90
39	90
40	80
41	50
42	15
43	44
44	77
45	99
46	99
47	99
48	77
49	33
50	48
51	84
52	108
53	108
54	108
55	96
56	60
57	18
58	52
59	91
60	117
61	117
62	117
63	117
64	91
65	39
66	56
67	98
68	126
69	126