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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 89 |
| 3 | 1391 |
| 4 | 24209 |
| 5 | 450231 |
| 6 | 8759337 |
| 7 | 176071263 |
| 8 | 3627907745 |
| 9 | 76217773799 |
| 10 | 1626477863801 |
| 11 | 35158334302927 |
| 12 | 768222871584817 |
| 13 | 16940297062253719 |
| 14 | 376507441510456905 |
| 15 | 8425543117906277055 |
| 16 | 189683436162271517505 |
| 17 | 4293057440192560395207 |
[1,7,89,1391,24209,450231,8759337,176071263, 3627907745,76217773799,1626477863801, 35158334302927,768222871584817,16940297062253719, 376507441510456905,8425543117906277055, 189683436162271517505,4293057440192560395207] |