| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 13 |
| 4 | 106 |
| 5 | 1856 |
| 6 | 65481 |
| 7 | 3925518 |
| 8 | 363749095 |
| 9 | 48962187281 |
| 10 | 9168714763163 |
| 11 | 2310658842185472 |
| 12 | 762989388539984938 |
| 13 | 322853634364149927118 |
| 14 | 171803197981333555941746 |
| 15 | 113132136587981136905043170 |
| 16 | 90904234140548490596254230897 |
[1,1,3,13,106,1856,65481,3925518,363749095, 48962187281,9168714763163,2310658842185472, 762989388539984938,322853634364149927118, 171803197981333555941746, 113132136587981136905043170, 90904234140548490596254230897] |