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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 9 |
| 2 | -72 |
| 3 | -801 |
| 4 | 5031 |
| 5 | 69912 |
| 6 | -337599 |
| 7 | -6000471 |
| 8 | 21345048 |
| 9 | 507383199 |
| 10 | -1221565689 |
| 11 | -42319604808 |
| 12 | 56627216001 |
| 13 | 3484515205449 |
| 14 | -1102289290632 |
| 15 | -283348020932001 |
| 16 | -194062588390809 |
| 17 | 22757127107101272 |
| 18 | 38476196766756801 |
| 19 | -1804851098908446231 |
[1,9,-72,-801,5031,69912,-337599,-6000471, 21345048,507383199,-1221565689,-42319604808, 56627216001,3484515205449,-1102289290632, -283348020932001,-194062588390809, 22757127107101272,38476196766756801, -1804851098908446231] |