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| n | a(n) |
|---|---|
| 1 | 375 |
| 2 | 1135 |
| 3 | 5085 |
| 4 | 21862 |
| 5 | 92225 |
| 6 | 391934 |
| 7 | 1669294 |
| 8 | 7114867 |
| 9 | 30309042 |
| 10 | 129016031 |
| 11 | 549319037 |
| 12 | 2339547000 |
| 13 | 9963141845 |
| 14 | 42425232250 |
| 15 | 180661430026 |
| 16 | 769335984173 |
| 17 | 3276146397838 |
| 18 | 13951092432179 |
| 19 | 59409215103993 |
| 20 | 252988054381898 |
[375,1135,5085,21862,92225,391934,1669294,7114867, 30309042,129016031,549319037,2339547000, 9963141845,42425232250,180661430026,769335984173, 3276146397838,13951092432179,59409215103993, 252988054381898] |