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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 61 |
| 3 | 595 |
| 4 | 6145 |
| 5 | 65527 |
| 6 | 712909 |
| 7 | 7863667 |
| 8 | 87615745 |
| 9 | 983726695 |
| 10 | 11112210781 |
| 11 | 126142119187 |
| 12 | 1437751935361 |
| 13 | 16443380994775 |
| 14 | 188609259215725 |
| 15 | 2168833084841395 |
| 16 | 24994269200292865 |
| 17 | 288596644195946695 |
| 18 | 3337978523215692925 |
| 19 | 38666734085509918675 |
[1,7,61,595,6145,65527,712909,7863667,87615745, 983726695,11112210781,126142119187,1437751935361, 16443380994775,188609259215725,2168833084841395, 24994269200292865,288596644195946695, 3337978523215692925,38666734085509918675] |