A123548 - cp's OEIS frontend

A123548 Triangle read by rows: T(n,k) = number of unlabeled bicolored graphs having 2n nodes and k edges, which are invariant when the two color classes are interchanged. Here n >= 0, 0 <= k <= n^2.

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	1
10	1
11	2
12	3
13	3
14	2
15	1
16	1
17	1
18	1
19	1
20	1
21	2
22	4
23	5
24	7
25	8
26	9
27	8
28	7
29	5
30	4
31	2
32	1
33	1
34	1
35	1
36	1
37	1
38	2
39	4
40	6
41	9
42	14
43	22
44	29
45	33
46	37
47	43
48	43
49	37
50	33
51	29
52	22
53	14
54	9
55	6
56	4
57	2
58	1
59	1
60	1
61	1
62	1
63	1
64	2
65	4
66	6
67	10
68	16
69	29
70	46
71	69
72	99
73	141
74	183
75	230
76	277
77	319
78	342
79	352
80	342
81	319
82	277
83	230
84	183
85	141
86	99
87	69
88	46
89	29
90	16
91	10
92	6
93	4
94	2
95	1
96	1
97	1

[1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 3, 3, 2, 1, 1, 1, 1, 1, 1, 2, 4, 5, 7, 8, 9, 8, 7, 5, 4, 2, 1, 1, 1, 1, 1, 1, 2, 4, 6, 9, 14, 22, 29, 33, 37, 43, 43, 37, 33, 29, 22, 14, 9, 6, 4, 2, 1, 1, 1, 1, 1, 1, 2, 4, 6, 10, 16, 29, 46, 69, 99, 141, 183, 230, 277, 319, 342, 352, 342, 319, 277, 230, 183, 141, 99, 69, 46, 29, 16, 10, 6, 4, 2, 1, 1, 1]

cp's OEIS Frontend

A123548 Triangle read by rows: T(n,k) = number of unlabeled bicolored graphs having 2n nodes and k edges, which are invariant when the two color classes are interchanged. Here n >= 0, 0 <= k <= n^2.

Table of values

List of values

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	1
10	1
11	2
12	3
13	3
14	2
15	1
16	1
17	1
18	1
19	1
20	1
21	2
22	4
23	5
24	7
25	8
26	9
27	8
28	7
29	5
30	4
31	2
32	1
33	1
34	1
35	1
36	1
37	1
38	2
39	4
40	6
41	9
42	14
43	22
44	29
45	33
46	37
47	43
48	43
49	37
50	33
51	29
52	22
53	14
54	9
55	6
56	4
57	2
58	1
59	1
60	1
61	1
62	1
63	1
64	2
65	4
66	6
67	10
68	16
69	29
70	46
71	69
72	99
73	141
74	183
75	230
76	277
77	319
78	342
79	352
80	342
81	319
82	277
83	230
84	183
85	141
86	99
87	69
88	46
89	29
90	16
91	10
92	6
93	4
94	2
95	1
96	1
97	1

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	1
10	1
11	2
12	3
13	3
14	2
15	1
16	1
17	1
18	1
19	1
20	1
21	2
22	4
23	5
24	7
25	8
26	9
27	8
28	7
29	5
30	4
31	2
32	1
33	1
34	1
35	1
36	1
37	1
38	2
39	4
40	6
41	9
42	14
43	22
44	29
45	33
46	37
47	43
48	43
49	37
50	33
51	29
52	22
53	14
54	9
55	6
56	4
57	2
58	1
59	1
60	1
61	1
62	1
63	1
64	2
65	4
66	6
67	10
68	16
69	29
70	46
71	69
72	99
73	141
74	183
75	230
76	277
77	319
78	342
79	352
80	342
81	319
82	277
83	230
84	183
85	141
86	99
87	69
88	46
89	29
90	16
91	10
92	6
93	4
94	2
95	1
96	1
97	1

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	1
10	1
11	2
12	3
13	3
14	2
15	1
16	1
17	1
18	1
19	1
20	1
21	2
22	4
23	5
24	7
25	8
26	9
27	8
28	7
29	5
30	4
31	2
32	1
33	1
34	1
35	1
36	1
37	1
38	2
39	4
40	6
41	9
42	14
43	22
44	29
45	33
46	37
47	43
48	43
49	37
50	33
51	29
52	22
53	14
54	9
55	6
56	4
57	2
58	1
59	1
60	1
61	1
62	1
63	1
64	2
65	4
66	6
67	10
68	16
69	29
70	46
71	69
72	99
73	141
74	183
75	230
76	277
77	319
78	342
79	352
80	342
81	319
82	277
83	230
84	183
85	141
86	99
87	69
88	46
89	29
90	16
91	10
92	6
93	4
94	2
95	1
96	1
97	1