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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 15 |
| 4 | 97 |
| 5 | 777 |
| 6 | 7379 |
| 7 | 80983 |
| 8 | 1007137 |
| 9 | 13986289 |
| 10 | 214383171 |
| 11 | 3593224767 |
| 12 | 65347120705 |
| 13 | 1281151315641 |
| 14 | 26928292883795 |
| 15 | 603928982033863 |
| 16 | 14392387319349697 |
| 17 | 363135896514611041 |
| 18 | 9669298448057196291 |
| 19 | 270932711729869233903 |
| 20 | 7967970654277850949025 |
[1,1,3,15,97,777,7379,80983,1007137,13986289, 214383171,3593224767,65347120705,1281151315641, 26928292883795,603928982033863,14392387319349697, 363135896514611041,9669298448057196291, 270932711729869233903,7967970654277850949025] |