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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 39 |
| 4 | 357 |
| 5 | 3471 |
| 6 | 35003 |
| 7 | 362265 |
| 8 | 3821877 |
| 9 | 40918431 |
| 10 | 443234475 |
| 11 | 4847042025 |
| 12 | 53425329675 |
| 13 | 592800026625 |
| 14 | 6615155585925 |
| 15 | 74183656771239 |
| 16 | 835491101084757 |
| 17 | 9445356930180735 |
| 18 | 107140324945955483 |
| 19 | 1218962144543118009 |
[1,5,39,357,3471,35003,362265,3821877,40918431, 443234475,4847042025,53425329675,592800026625, 6615155585925,74183656771239,835491101084757, 9445356930180735,107140324945955483, 1218962144543118009] |