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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 5 |
| 3 | 52 |
| 4 | 849 |
| 5 | 18996 |
| 6 | 540986 |
| 7 | 18726247 |
| 8 | 763480675 |
| 9 | 35837071558 |
| 10 | 1903538106065 |
| 11 | 112880374866172 |
| 12 | 7392418912962210 |
| 13 | 529898419942327801 |
| 14 | 41266682731537698181 |
| 15 | 3469461853041348996044 |
| 16 | 313200848521114144611273 |
| 17 | 30215925892728362737156556 |
[0,1,5,52,849,18996,540986,18726247,763480675, 35837071558,1903538106065,112880374866172, 7392418912962210,529898419942327801, 41266682731537698181,3469461853041348996044, 313200848521114144611273, 30215925892728362737156556] |