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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 61 |
| 4 | 591 |
| 5 | 6101 |
| 6 | 65719 |
| 7 | 729933 |
| 8 | 8297247 |
| 9 | 96044101 |
| 10 | 1128138567 |
| 11 | 13411861629 |
| 12 | 161066465583 |
| 13 | 1950996039669 |
| 14 | 23808159962839 |
| 15 | 292413627476141 |
| 16 | 3611870017079871 |
| 17 | 44838216520062117 |
| 18 | 559127724970143079 |
| 19 | 7000374603097246173 |
| 20 | 87964883375131331151 |
[1,1,7,61,591,6101,65719,729933,8297247,96044101, 1128138567,13411861629,161066465583,1950996039669, 23808159962839,292413627476141,3611870017079871, 44838216520062117,559127724970143079, 7000374603097246173,87964883375131331151] |