A259342 - cp's OEIS frontend

A259342 Irregular triangle read by rows: T(n,k) = number of equivalence classes of binary sequences of length n containing exactly 2k ones.

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	2
8	1
9	1
10	2
11	1
12	1
13	3
14	3
15	1
16	1
17	3
18	4
19	1
20	1
21	4
22	8
23	4
24	1
25	1
26	4
27	10
28	7
29	1
30	1
31	5
32	16
33	16
34	5
35	1
36	1
37	5
38	20
39	26
40	10
41	1
42	1
43	6
44	29
45	50
46	29
47	6
48	1
49	1
50	6
51	35
52	76
53	57
54	14
55	1
56	1
57	7
58	47
59	126
60	126
61	47
62	7
63	1
64	1
65	7
66	56
67	185
68	232
69	111
70	19
71	1
72	1
73	8
74	72
75	280
76	440
77	280
78	72
79	8
80	1

[1, 1, 1, 1, 1, 1, 2, 1, 1, 2, 1, 1, 3, 3, 1, 1, 3, 4, 1, 1, 4, 8, 4, 1, 1, 4, 10, 7, 1, 1, 5, 16, 16, 5, 1, 1, 5, 20, 26, 10, 1, 1, 6, 29, 50, 29, 6, 1, 1, 6, 35, 76, 57, 14, 1, 1, 7, 47, 126, 126, 47, 7, 1, 1, 7, 56, 185, 232, 111, 19, 1, 1, 8, 72, 280, 440, 280, 72, 8, 1]

cp's OEIS Frontend

A259342 Irregular triangle read by rows: T(n,k) = number of equivalence classes of binary sequences of length n containing exactly 2k ones.

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	2
8	1
9	1
10	2
11	1
12	1
13	3
14	3
15	1
16	1
17	3
18	4
19	1
20	1
21	4
22	8
23	4
24	1
25	1
26	4
27	10
28	7
29	1
30	1
31	5
32	16
33	16
34	5
35	1
36	1
37	5
38	20
39	26
40	10
41	1
42	1
43	6
44	29
45	50
46	29
47	6
48	1
49	1
50	6
51	35
52	76
53	57
54	14
55	1
56	1
57	7
58	47
59	126
60	126
61	47
62	7
63	1
64	1
65	7
66	56
67	185
68	232
69	111
70	19
71	1
72	1
73	8
74	72
75	280
76	440
77	280
78	72
79	8
80	1

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	2
8	1
9	1
10	2
11	1
12	1
13	3
14	3
15	1
16	1
17	3
18	4
19	1
20	1
21	4
22	8
23	4
24	1
25	1
26	4
27	10
28	7
29	1
30	1
31	5
32	16
33	16
34	5
35	1
36	1
37	5
38	20
39	26
40	10
41	1
42	1
43	6
44	29
45	50
46	29
47	6
48	1
49	1
50	6
51	35
52	76
53	57
54	14
55	1
56	1
57	7
58	47
59	126
60	126
61	47
62	7
63	1
64	1
65	7
66	56
67	185
68	232
69	111
70	19
71	1
72	1
73	8
74	72
75	280
76	440
77	280
78	72
79	8
80	1

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	2
8	1
9	1
10	2
11	1
12	1
13	3
14	3
15	1
16	1
17	3
18	4
19	1
20	1
21	4
22	8
23	4
24	1
25	1
26	4
27	10
28	7
29	1
30	1
31	5
32	16
33	16
34	5
35	1
36	1
37	5
38	20
39	26
40	10
41	1
42	1
43	6
44	29
45	50
46	29
47	6
48	1
49	1
50	6
51	35
52	76
53	57
54	14
55	1
56	1
57	7
58	47
59	126
60	126
61	47
62	7
63	1
64	1
65	7
66	56
67	185
68	232
69	111
70	19
71	1
72	1
73	8
74	72
75	280
76	440
77	280
78	72
79	8
80	1