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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 18 |
| 3 | 525 |
| 4 | 17340 |
| 5 | 586177 |
| 6 | 19896030 |
| 7 | 675781821 |
| 8 | 22956120408 |
| 9 | 779829016225 |
| 10 | 26491211221770 |
| 11 | 899921240562957 |
| 12 | 30570830315362260 |
| 13 | 1038508305678375841 |
| 14 | 35278711540581704598 |
| 15 | 1198437683944896688125 |
| 16 | 40711602541832856049200 |
| 17 | 1382996048733983114022337 |
[1,18,525,17340,586177,19896030,675781821, 22956120408,779829016225,26491211221770, 899921240562957,30570830315362260, 1038508305678375841,35278711540581704598, 1198437683944896688125,40711602541832856049200, 1382996048733983114022337] |