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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 21 |
| 3 | 341 |
| 4 | 5461 |
| 5 | 87381 |
| 6 | 1398101 |
| 7 | 22369621 |
| 8 | 357913941 |
| 9 | 5726623061 |
| 10 | 91625968981 |
| 11 | 1466015503701 |
| 12 | 23456248059221 |
| 13 | 375299968947541 |
| 14 | 6004799503160661 |
| 15 | 96076792050570581 |
| 16 | 1537228672809129301 |
| 17 | 24595658764946068821 |
| 18 | 393530540239137101141 |
| 19 | 6296488643826193618261 |
| 20 | 100743818301219097892181 |
[1,21,341,5461,87381,1398101,22369621,357913941, 5726623061,91625968981,1466015503701, 23456248059221,375299968947541,6004799503160661, 96076792050570581,1537228672809129301, 24595658764946068821,393530540239137101141, 6296488643826193618261,100743818301219097892181] |