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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 104 |
| 3 | 1699 |
| 4 | 23904 |
| 5 | 317044 |
| 6 | 4101107 |
| 7 | 52473796 |
| 8 | 668177568 |
| 9 | 8490113467 |
| 10 | 107776172264 |
| 11 | 1367566963756 |
| 12 | 17349734444643 |
| 13 | 220090218116188 |
| 14 | 2791852592070632 |
| 15 | 35414167120396459 |
| 16 | 449219270600324928 |
| 17 | 5698208011194600148 |
| 18 | 72279907017666274643 |
| 19 | 916846410588661477204 |
[4,104,1699,23904,317044,4101107,52473796, 668177568,8490113467,107776172264,1367566963756, 17349734444643,220090218116188,2791852592070632, 35414167120396459,449219270600324928, 5698208011194600148,72279907017666274643, 916846410588661477204] |