| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 3 |
| 8 | 23 |
| 9 | 47 |
| 10 | 75 |
| 11 | 181 |
| 12 | 675 |
| 13 | 3025 |
| 14 | 16403 |
| 15 | 71953 |
| 16 | 340893 |
| 17 | 1986607 |
| 18 | 14754733 |
| 19 | 121306057 |
| 20 | 1066980245 |
| 21 | 9641071515 |
| 22 | 101852566849 |
| 23 | 1271193446821 |
[1,1,1,1,1,1,3,23,47,75,181,675,3025,16403,71953, 340893,1986607,14754733,121306057,1066980245, 9641071515,101852566849,1271193446821] |