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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 18 |
| 3 | 142 |
| 4 | 1000 |
| 5 | 7388 |
| 6 | 54611 |
| 7 | 402928 |
| 8 | 2973312 |
| 9 | 21942164 |
| 10 | 161924976 |
| 11 | 1194944253 |
| 12 | 8818235182 |
| 13 | 65075230158 |
| 14 | 480230500262 |
| 15 | 3543918833192 |
| 16 | 26152776005975 |
| 17 | 192997561438126 |
| 18 | 1424248757071714 |
| 19 | 10510415297046298 |
| 20 | 77562875984896828 |
[1,18,142,1000,7388,54611,402928,2973312,21942164, 161924976,1194944253,8818235182,65075230158, 480230500262,3543918833192,26152776005975, 192997561438126,1424248757071714, 10510415297046298,77562875984896828] |