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| n | a(n) |
|---|---|
| 4 | 151 |
| 5 | 1207 |
| 6 | 8911 |
| 7 | 63775 |
| 8 | 450631 |
| 9 | 3167047 |
| 10 | 22207231 |
| 11 | 155564335 |
| 12 | 1089291511 |
| 13 | 7626064087 |
| 14 | 53385519151 |
| 15 | 373707845695 |
| 16 | 2615982554791 |
| 17 | 18311960788327 |
| 18 | 128183974232671 |
| 19 | 897288565771855 |
| 20 | 6281022198832471 |
| 21 | 43967162107115767 |
| 22 | 307770154895675791 |
[151,1207,8911,63775,450631,3167047,22207231, 155564335,1089291511,7626064087,53385519151, 373707845695,2615982554791,18311960788327, 128183974232671,897288565771855,6281022198832471, 43967162107115767,307770154895675791] |