| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 15 |
| 4 | 97 |
| 5 | 112 |
| 6 | 3233 |
| 7 | 3345 |
| 8 | 23303 |
| 9 | 49951 |
| 10 | 323009 |
| 11 | 372960 |
| 12 | 10765889 |
| 13 | 11138849 |
| 14 | 77598983 |
| 15 | 166336815 |
| 16 | 1075619873 |
| 17 | 1241956688 |
| 18 | 35850407137 |
| 19 | 37092363825 |
| 20 | 258404590087 |
| 21 | 553901543999 |
| 22 | 3581813854081 |
| 23 | 4135715398080 |
| 24 | 119381845000321 |
| 25 | 123517560398401 |
[1,1,7,15,97,112,3233,3345,23303,49951,323009, 372960,10765889,11138849,77598983,166336815, 1075619873,1241956688,35850407137,37092363825, 258404590087,553901543999,3581813854081, 4135715398080,119381845000321,123517560398401] |