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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 27 |
| 4 | 173 |
| 5 | 1330 |
| 6 | 12134 |
| 7 | 129359 |
| 8 | 1587501 |
| 9 | 22127494 |
| 10 | 346245249 |
| 11 | 6021401618 |
| 12 | 115373290404 |
| 13 | 2417393483696 |
| 14 | 55028734386699 |
| 15 | 1353170738090204 |
| 16 | 35764709876549353 |
| 17 | 1011496211524329699 |
| 18 | 30490289594142366215 |
[1,1,5,27,173,1330,12134,129359,1587501,22127494, 346245249,6021401618,115373290404,2417393483696, 55028734386699,1353170738090204,35764709876549353, 1011496211524329699,30490289594142366215] |