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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 71 |
| 4 | 1291 |
| 5 | 32186 |
| 6 | 1030491 |
| 7 | 40606281 |
| 8 | 1911466016 |
| 9 | 105145651821 |
| 10 | 6645220590851 |
| 11 | 476096681256716 |
| 12 | 38249611004598701 |
| 13 | 3415114289928480181 |
| 14 | 336324126216378275806 |
| 15 | 36299781235381103548731 |
[1,1,6,71,1291,32186,1030491,40606281,1911466016, 105145651821,6645220590851,476096681256716, 38249611004598701,3415114289928480181, 336324126216378275806,36299781235381103548731] |