A006856 - cp's OEIS frontend

A006856 Maximal number of edges in n-node graph of girth at least 5.

n	a(n)
1	0
2	1
3	2
4	3
5	5
6	6
7	8
8	10
9	12
10	15
11	16
12	18
13	21
14	23
15	26
16	28
17	31
18	34
19	38
20	41
21	44
22	47
23	50
24	54
25	57
26	61
27	65
28	68
29	72
30	76
31	80
32	85
33	87
34	90
35	95
36	99
37	104
38	109
39	114
40	120
41	124
42	129
43	134
44	139
45	145
46	150
47	156
48	162
49	168
50	175
51	176
52	178
53	181

[0, 1, 2, 3, 5, 6, 8, 10, 12, 15, 16, 18, 21, 23, 26, 28, 31, 34, 38, 41, 44, 47, 50, 54, 57, 61, 65, 68, 72, 76, 80, 85, 87, 90, 95, 99, 104, 109, 114, 120, 124, 129, 134, 139, 145, 150, 156, 162, 168, 175, 176, 178, 181]

cp's OEIS Frontend

A006856 Maximal number of edges in n-node graph of girth at least 5.

Table of values

List of values

n	a(n)
1	0
2	1
3	2
4	3
5	5
6	6
7	8
8	10
9	12
10	15
11	16
12	18
13	21
14	23
15	26
16	28
17	31
18	34
19	38
20	41
21	44
22	47
23	50
24	54
25	57
26	61
27	65
28	68
29	72
30	76
31	80
32	85
33	87
34	90
35	95
36	99
37	104
38	109
39	114
40	120
41	124
42	129
43	134
44	139
45	145
46	150
47	156
48	162
49	168
50	175
51	176
52	178
53	181

n	a(n)
1	0
2	1
3	2
4	3
5	5
6	6
7	8
8	10
9	12
10	15
11	16
12	18
13	21
14	23
15	26
16	28
17	31
18	34
19	38
20	41
21	44
22	47
23	50
24	54
25	57
26	61
27	65
28	68
29	72
30	76
31	80
32	85
33	87
34	90
35	95
36	99
37	104
38	109
39	114
40	120
41	124
42	129
43	134
44	139
45	145
46	150
47	156
48	162
49	168
50	175
51	176
52	178
53	181

n	a(n)
1	0
2	1
3	2
4	3
5	5
6	6
7	8
8	10
9	12
10	15
11	16
12	18
13	21
14	23
15	26
16	28
17	31
18	34
19	38
20	41
21	44
22	47
23	50
24	54
25	57
26	61
27	65
28	68
29	72
30	76
31	80
32	85
33	87
34	90
35	95
36	99
37	104
38	109
39	114
40	120
41	124
42	129
43	134
44	139
45	145
46	150
47	156
48	162
49	168
50	175
51	176
52	178
53	181