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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 87 |
| 3 | 174 |
| 4 | 545 |
| 5 | 3404 |
| 6 | 11700 |
| 7 | 50281 |
| 8 | 252069 |
| 9 | 959723 |
| 10 | 5014754 |
| 11 | 21265779 |
| 12 | 97686188 |
| 13 | 454095979 |
| 14 | 1911405908 |
| 15 | 9090872300 |
| 16 | 40760423923 |
| 17 | 177043945473 |
| 18 | 836152068055 |
| 19 | 3685193095173 |
| 20 | 16440527244397 |
| 21 | 75962562059779 |
| 22 | 337317605161865 |
[8,87,174,545,3404,11700,50281,252069,959723, 5014754,21265779,97686188,454095979,1911405908, 9090872300,40760423923,177043945473,836152068055, 3685193095173,16440527244397,75962562059779, 337317605161865] |