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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 9 |
| 2 | 116 |
| 3 | 1759 |
| 4 | 29240 |
| 5 | 515586 |
| 6 | 9472148 |
| 7 | 179354443 |
| 8 | 3475611320 |
| 9 | 68596806526 |
| 10 | 1374120750024 |
| 11 | 27866293012310 |
| 12 | 570976113323200 |
| 13 | 11802661529071572 |
| 14 | 245833031231543508 |
| 15 | 5154362626175496451 |
| 16 | 108701887094349555800 |
| 17 | 2304298763507320874310 |
[1,9,116,1759,29240,515586,9472148,179354443, 3475611320,68596806526,1374120750024, 27866293012310,570976113323200,11802661529071572, 245833031231543508,5154362626175496451, 108701887094349555800,2304298763507320874310] |