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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 51 |
| 3 | 581 |
| 4 | 6963 |
| 5 | 85905 |
| 6 | 1079943 |
| 7 | 13756216 |
| 8 | 176939187 |
| 9 | 2292988919 |
| 10 | 29892396451 |
| 11 | 391576960230 |
| 12 | 5150057095527 |
| 13 | 67962810381653 |
| 14 | 899458144305408 |
| 15 | 11933576896320981 |
| 16 | 158672857603511987 |
| 17 | 2113800649819533735 |
| 18 | 28207266176359605705 |
| 19 | 376976971371883606824 |
[1,5,51,581,6963,85905,1079943,13756216,176939187, 2292988919,29892396451,391576960230,5150057095527, 67962810381653,899458144305408,11933576896320981, 158672857603511987,2113800649819533735, 28207266176359605705,376976971371883606824] |