A331438 - cp's OEIS frontend

A331438 Irregular triangle read by rows: T(n,k) = number of homeomorphically irreducible connected labeled graphs with n vertices and k edges, n >= 1, 0 <= k <= n*(n-1)/2.

n	a(n)
1	1
2	0
3	1
4	0
5	0
6	0
7	0
8	0
9	0
10	0
11	4
12	0
13	0
14	1
15	0
16	0
17	0
18	0
19	5
20	0
21	0
22	20
23	15
24	10
25	1
26	0
27	0
28	0
29	0
30	0
31	96
32	120
33	180
34	420
35	700
36	837
37	765
38	395
39	105
40	15
41	1
42	0
43	0
44	0
45	0
46	0
47	0
48	427
49	1260
50	3780
51	10850
52	24045
53	44814
54	68040
55	80955
56	70500
57	43232
58	18774
59	5880
60	1330
61	210
62	21
63	1
64	0
65	0
66	0
67	0
68	0
69	0
70	0
71	6448
72	23520
73	79800
74	269360
75	782880
76	1956136
77	4203360
78	7610340
79	11365676

[1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 1, 0, 0, 0, 0, 5, 0, 0, 20, 15, 10, 1, 0, 0, 0, 0, 0, 96, 120, 180, 420, 700, 837, 765, 395, 105, 15, 1, 0, 0, 0, 0, 0, 0, 427, 1260, 3780, 10850, 24045, 44814, 68040, 80955, 70500, 43232, 18774, 5880, 1330, 210, 21, 1, 0, 0, 0, 0, 0, 0, 0, 6448, 23520, 79800, 269360, 782880, 1956136, 4203360, 7610340, 11365676]

cp's OEIS Frontend

A331438 Irregular triangle read by rows: T(n,k) = number of homeomorphically irreducible connected labeled graphs with n vertices and k edges, n >= 1, 0 <= k <= n*(n-1)/2.

Table of values

List of values