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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 44 |
| 4 | 481 |
| 5 | 9254 |
| 6 | 326395 |
| 7 | 21927776 |
| 8 | 2874607189 |
| 9 | 744650622170 |
| 10 | 383510575423471 |
| 11 | 393869218949592212 |
| 12 | 807827718206737362889 |
| 13 | 3311287802485779192925838 |
| 14 | 27136007596894473408507305443 |
| 15 | 444677773080105539125038867872456 |
| 16 | 14572535437424416878539776253365375549 |
[1,2,7,44,481,9254,326395,21927776,2874607189, 744650622170,383510575423471,393869218949592212, 807827718206737362889,3311287802485779192925838, 27136007596894473408507305443, 444677773080105539125038867872456, 14572535437424416878539776253365375549] |