n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 15 |
3 | 84 |
4 | 715 |
5 | 8568 |
6 | 134596 |
7 | 2629575 |
8 | 61523748 |
9 | 1677106640 |
10 | 52179482355 |
11 | 1823810410032 |
12 | 70724320184700 |
13 | 3012192716517082 |
14 | 139737927523546800 |
15 | 7012067478708989884 |
16 | 378371310857796292200 |
17 | 21843987843214746108900 |
[1,4,15,84,715,8568,134596,2629575,61523748, 1677106640,52179482355,1823810410032, 70724320184700,3012192716517082, 139737927523546800,7012067478708989884, 378371310857796292200,21843987843214746108900] |