A078623 - cp's OEIS frontend

A078623 Number of matched parentheses and brackets of length n, where a closing bracket will close any remaining open parentheses back to the matching open bracket (as in some versions of LISP).

n	a(n)
0	1
1	0
2	2
3	1
4	9
5	11
6	56
7	106
8	421
9	1009
10	3565
11	9736
12	32594
13	95811
14	313535
15	961780
16	3123577
17	9831373
18	31915121
19	102110314
20	332366526
21	1075228773
22	3513373374
23	11456961550
24	37590603312
25	123327267531
26	406246177511
27	1339274997451
28	4427777075497
29	14655559052686

[1, 0, 2, 1, 9, 11, 56, 106, 421, 1009, 3565, 9736, 32594, 95811, 313535, 961780, 3123577, 9831373, 31915121, 102110314, 332366526, 1075228773, 3513373374, 11456961550, 37590603312, 123327267531, 406246177511, 1339274997451, 4427777075497, 14655559052686]

cp's OEIS Frontend

A078623 Number of matched parentheses and brackets of length n, where a closing bracket will close any remaining open parentheses back to the matching open bracket (as in some versions of LISP).

Table of values

List of values