n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 7 |
4 | 30 |
5 | 155 |
6 | 950 |
7 | 6706 |
8 | 52996 |
9 | 459256 |
10 | 4303020 |
11 | 43163392 |
12 | 460170882 |
13 | 5184956805 |
14 | 61468942912 |
15 | 763967696243 |
16 | 9924157671028 |
17 | 134400823231643 |
18 | 1893397004671954 |
19 | 27693154054839058 |
20 | 419804185629085664 |
[1,2,7,30,155,950,6706,52996,459256,4303020, 43163392,460170882,5184956805,61468942912, 763967696243,9924157671028,134400823231643, 1893397004671954,27693154054839058, 419804185629085664] |