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| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 178 |
| 3 | 6637 |
| 4 | 231634 |
| 5 | 6834071 |
| 6 | 172829660 |
| 7 | 3863292782 |
| 8 | 78707033574 |
| 9 | 1486531293773 |
| 10 | 26259974129736 |
| 11 | 436343046973638 |
| 12 | 6852864363413734 |
| 13 | 102181393016110488 |
| 14 | 1452423119694197264 |
| 15 | 19751638780937813473 |
[21,178,6637,231634,6834071,172829660,3863292782, 78707033574,1486531293773,26259974129736, 436343046973638,6852864363413734, 102181393016110488,1452423119694197264, 19751638780937813473] |