n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 3 |
3 | 9 |
4 | 30 |
5 | 99 |
6 | 333 |
7 | 1144 |
8 | 3978 |
9 | 13995 |
10 | 49742 |
11 | 178296 |
12 | 643842 |
13 | 2340135 |
14 | 8554275 |
15 | 31429026 |
16 | 115997970 |
17 | 429874830 |
18 | 1598952366 |
19 | 5967382200 |
20 | 22338765540 |
21 | 83859016527 |
22 | 315614844558 |
23 | 1190680751376 |
24 | 4501802223090 |
25 | 17055399281284 |
[0,1,3,9,30,99,333,1144,3978,13995,49742,178296, 643842,2340135,8554275,31429026,115997970, 429874830,1598952366,5967382200,22338765540, 83859016527,315614844558,1190680751376, 4501802223090,17055399281284] |