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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 51 |
| 3 | 515 |
| 4 | 5201 |
| 5 | 52525 |
| 6 | 530451 |
| 7 | 5357035 |
| 8 | 54100801 |
| 9 | 546365045 |
| 10 | 5517751251 |
| 11 | 55723877555 |
| 12 | 562756526801 |
| 13 | 5683289145565 |
| 14 | 57395647982451 |
| 15 | 579639768970075 |
| 16 | 5853793337683201 |
| 17 | 59117573145802085 |
| 18 | 597029524795704051 |
| 19 | 6029412821102842595 |
| 20 | 60891157735824130001 |
| 21 | 614940990179344142605 |
[1,5,51,515,5201,52525,530451,5357035,54100801, 546365045,5517751251,55723877555,562756526801, 5683289145565,57395647982451,579639768970075, 5853793337683201,59117573145802085, 597029524795704051,6029412821102842595, 60891157735824130001,614940990179344142605] |