A160449 - cp's OEIS frontend

A160449 Array read by antidiagonals: T(n,k) is the number of isomorphism classes of n-fold coverings of a connected graph with Betti number k (1 <= n, 0 <= k).

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	1
6	1
7	3
8	4
9	1
10	1
11	5
12	11
13	8
14	1
15	1
16	7
17	43
18	49
19	16
20	1
21	1
22	11
23	161
24	681
25	251
26	32
27	1
28	1
29	15
30	901
31	14721
32	14491
33	1393
34	64
35	1
36	1
37	22
38	5579
39	524137
40	1730861
41	336465
42	8051
43	128
44	1
45	1
46	30
47	43206
48	25471105
49	373486525
50	207388305
51	7997683
52	47449
53	256
54	1

[1, 1, 1, 1, 2, 1, 1, 3, 4, 1, 1, 5, 11, 8, 1, 1, 7, 43, 49, 16, 1, 1, 11, 161, 681, 251, 32, 1, 1, 15, 901, 14721, 14491, 1393, 64, 1, 1, 22, 5579, 524137, 1730861, 336465, 8051, 128, 1, 1, 30, 43206, 25471105, 373486525, 207388305, 7997683, 47449, 256, 1]

cp's OEIS Frontend

A160449 Array read by antidiagonals: T(n,k) is the number of isomorphism classes of n-fold coverings of a connected graph with Betti number k (1 <= n, 0 <= k).

Table of values

List of values