A370885 - cp's OEIS frontend

A370885 Irregular triangle read by rows: T(n,k) is the total number of unmatched parentheses (both left and right) in the k-th string of parentheses of length n, where strings within a row are in reverse lexicographical order.

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

[0, 1, 1, 2, 2, 0, 2, 3, 3, 1, 3, 1, 1, 1, 3, 4, 4, 2, 4, 2, 2, 2, 4, 2, 2, 0, 2, 0, 2, 2, 4, 5, 5, 3, 5, 3, 3, 3, 5, 3, 3, 1, 3, 1, 3, 3, 5, 3, 3, 1, 3, 1, 1, 1, 3, 1, 1, 1, 3, 1, 3, 3, 5, 6, 6, 4, 6, 4, 4, 4, 6, 4, 4, 2, 4, 2, 4, 4, 6, 4, 4, 2, 4, 2, 2, 2, 4, 2]

cp's OEIS Frontend

A370885 Irregular triangle read by rows: T(n,k) is the total number of unmatched parentheses (both left and right) in the k-th string of parentheses of length n, where strings within a row are in reverse lexicographical order.

Table of values

List of values

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

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

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