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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 15 |
| 3 | 211 |
| 4 | 4433 |
| 5 | 124741 |
| 6 | 4412815 |
| 7 | 188335981 |
| 8 | 9421966209 |
| 9 | 540884623753 |
| 10 | 35054089163351 |
| 11 | 2531882857204273 |
| 12 | 201689970517618225 |
| 13 | 17567711167993834381 |
| 14 | 1661084543502646535967 |
| 15 | 169448367505003640681221 |
| 16 | 18550123929621138841581185 |
| 17 | 2169272360350263071212545553 |
[1,2,15,211,4433,124741,4412815,188335981, 9421966209,540884623753,35054089163351, 2531882857204273,201689970517618225, 17567711167993834381,1661084543502646535967, 169448367505003640681221, 18550123929621138841581185, 2169272360350263071212545553] |