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| n | a(n) |
|---|---|
| 3 | 91 |
| 4 | 1681 |
| 5 | 2911 |
| 6 | 28561 |
| 7 | 79808 |
| 8 | 591361 |
| 9 | 2091817 |
| 10 | 13344409 |
| 11 | 53924597 |
| 12 | 315169009 |
| 13 | 1380947751 |
| 14 | 7649951296 |
| 15 | 35269184041 |
| 16 | 188926707649 |
| 17 | 899769503723 |
| 18 | 4718266032649 |
| 19 | 22943942934823 |
| 20 | 118691459382721 |
| 21 | 584955154102592 |
| 22 | 2999832755191441 |
| 23 | 14912246613880433 |
| 24 | 76049269944443041 |
| 25 | 380145205524781061 |
[91,1681,2911,28561,79808,591361,2091817,13344409, 53924597,315169009,1380947751,7649951296, 35269184041,188926707649,899769503723, 4718266032649,22943942934823,118691459382721, 584955154102592,2999832755191441, 14912246613880433,76049269944443041, 380145205524781061] |