A245390 - cp's OEIS frontend

A245390 Number of ways to build an expression using non-redundant parentheses in an expression of n variables, counted in decreasing sub-partitions of equal size.

n	a(n)
1	1
2	1
3	3
4	11
5	39
6	145
7	514
8	1901
9	6741
10	24880
11	87791
12	325634
13	1152725
14	4251234
15	15052387
16	55750323
17	197031808
18	729360141
19	2579285955
20	9539017676
21	33822222227
22	124889799518
23	440743675148
24	1635528366655
25	5790967247863
26	21360573026444
27	75643815954959
28	280096917425535

[1, 1, 3, 11, 39, 145, 514, 1901, 6741, 24880, 87791, 325634, 1152725, 4251234, 15052387, 55750323, 197031808, 729360141, 2579285955, 9539017676, 33822222227, 124889799518, 440743675148, 1635528366655, 5790967247863, 21360573026444, 75643815954959, 280096917425535]

cp's OEIS Frontend

A245390 Number of ways to build an expression using non-redundant parentheses in an expression of n variables, counted in decreasing sub-partitions of equal size.

Table of values

List of values