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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 61 |
| 4 | 442 |
| 5 | 8671 |
| 6 | 48643 |
| 7 | 275491 |
| 8 | 4691011 |
| 9 | 44046781 |
| 10 | 421781671 |
| 11 | 4866217861 |
| 12 | 44417846491 |
| 13 | 469583176771 |
| 14 | 4807072338781 |
| 15 | 42155398282291 |
| 16 | 461921395126861 |
| 17 | 4447050855867481 |
| 18 | 42996432430288771 |
| 19 | 480551127927589171 |
| 20 | 4866530171154022291 |
| 21 | 46198061648602166491 |
[1,4,61,442,8671,48643,275491,4691011,44046781, 421781671,4866217861,44417846491,469583176771, 4807072338781,42155398282291,461921395126861, 4447050855867481,42996432430288771, 480551127927589171,4866530171154022291, 46198061648602166491] |