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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 7 |
| 3 | 5 |
| 4 | 47 |
| 5 | 13 |
| 6 | 295 |
| 7 | 1909 |
| 8 | 1631 |
| 9 | 13085 |
| 10 | 6487 |
| 11 | 84997 |
| 12 | 517135 |
| 13 | 502829 |
| 14 | 3605639 |
| 15 | 2428309 |
| 16 | 24062143 |
| 17 | 5077565 |
| 18 | 149450423 |
| 19 | 985222181 |
| 20 | 808182895 |
| 21 | 6719515981 |
| 22 | 2978678759 |
| 23 | 43295774645 |
| 24 | 267326277407 |
| 25 | 252223018333 |
| 26 | 1856180682775 |
[0,1,7,5,47,13,295,1909,1631,13085,6487,84997, 517135,502829,3605639,2428309,24062143,5077565, 149450423,985222181,808182895,6719515981, 2978678759,43295774645,267326277407,252223018333, 1856180682775] |