n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 5 |
4 | 14 |
5 | 42 |
6 | 132 |
7 | 428 |
8 | 1416 |
9 | 4744 |
10 | 16016 |
11 | 54320 |
12 | 184736 |
13 | 629280 |
14 | 2145600 |
15 | 7319744 |
16 | 24979584 |
17 | 85262464 |
18 | 291057920 |
19 | 993641216 |
20 | 3392317952 |
21 | 11581727232 |
22 | 39541748736 |
23 | 135002491904 |
24 | 460924372992 |
25 | 1573688313856 |
26 | 5372896120832 |
27 | 18344191078400 |
28 | 62630938517504 |
[1,1,2,5,14,42,132,428,1416,4744,16016,54320, 184736,629280,2145600,7319744,24979584,85262464, 291057920,993641216,3392317952,11581727232, 39541748736,135002491904,460924372992, 1573688313856,5372896120832,18344191078400, 62630938517504] |