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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 7 |
| 5 | 25 |
| 6 | 55 |
| 7 | 97 |
| 8 | 1087 |
| 9 | 13473 |
| 10 | 96815 |
| 11 | 552449 |
| 12 | 7876407 |
| 13 | 210244561 |
| 14 | 4886389831 |
| 15 | 91609323633 |
| 16 | 2669503927735 |
| 17 | 132662824311297 |
| 18 | 8063542123697063 |
| 19 | 467664413878234705 |
[1,7,25,55,97,1087,13473,96815,552449,7876407, 210244561,4886389831,91609323633,2669503927735, 132662824311297,8063542123697063, 467664413878234705] |