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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 22 |
| 3 | 646 |
| 4 | 28847 |
| 5 | 1741588 |
| 6 | 133980041 |
| 7 | 12608022914 |
| 8 | 1409256807168 |
| 9 | 183015824998133 |
| 10 | 27146136664293731 |
| 11 | 4536471294450895300 |
| 12 | 844659618442741504695 |
| 13 | 173611839268827045840473 |
| 14 | 39085824299332714462271372 |
| 15 | 9574184453657569104285899833 |
| 16 | 2536995721294132939799176959316 |
| 17 | 723576083578946843489853252981403 |
| 18 | 221140244488698891750492920932788745 |
[1,2,22,646,28847,1741588,133980041,12608022914, 1409256807168,183015824998133,27146136664293731, 4536471294450895300,844659618442741504695, 173611839268827045840473, 39085824299332714462271372, 9574184453657569104285899833, 2536995721294132939799176959316, 723576083578946843489853252981403, 221140244488698891750492920932788745] |