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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 34 |
| 4 | 276 |
| 5 | 2509 |
| 6 | 24739 |
| 7 | 259815 |
| 8 | 2873376 |
| 9 | 33207790 |
| 10 | 398897289 |
| 11 | 4960652325 |
| 12 | 63676368387 |
| 13 | 841741913795 |
| 14 | 11438028248093 |
| 15 | 159536511439266 |
| 16 | 2281321298635427 |
| 17 | 33411684617642665 |
| 18 | 500761214428795093 |
| 19 | 7674842860939188928 |
| 20 | 120209960716130232745 |
[1,1,5,34,276,2509,24739,259815,2873376,33207790, 398897289,4960652325,63676368387,841741913795, 11438028248093,159536511439266,2281321298635427, 33411684617642665,500761214428795093, 7674842860939188928,120209960716130232745] |