A280789 - cp's OEIS frontend

A280789 Triangle read by rows: number of topologically distinct sets of N circles with one pair touching, classified according to number of factors.

n	a(n)
2	1
3	2
4	1
5	6
6	3
7	1
8	16
9	10
10	3
11	1
12	46
13	30
14	11
15	3
16	1
17	128
18	91
19	34
20	11
21	3
22	1
23	364
24	268
25	108
26	35
27	11
28	3
29	1
30	1029
31	790
32	327
33	112
34	35
35	11
36	3
37	1
38	2930
39	2308
40	992
41	344
42	113
43	35
44	11
45	3
46	1
47	8344
48	6737
49	2962
50	1055
51	348
52	113
53	35
54	11
55	3
56	1

[1, 2, 1, 6, 3, 1, 16, 10, 3, 1, 46, 30, 11, 3, 1, 128, 91, 34, 11, 3, 1, 364, 268, 108, 35, 11, 3, 1, 1029, 790, 327, 112, 35, 11, 3, 1, 2930, 2308, 992, 344, 113, 35, 11, 3, 1, 8344, 6737, 2962, 1055, 348, 113, 35, 11, 3, 1]

cp's OEIS Frontend

A280789 Triangle read by rows: number of topologically distinct sets of N circles with one pair touching, classified according to number of factors.

Table of values

List of values