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| n | a(n) |
|---|---|
| 1 | 20 |
| 2 | 631 |
| 3 | 19827 |
| 4 | 499474 |
| 5 | 9603489 |
| 6 | 144262866 |
| 7 | 1757594146 |
| 8 | 17915547783 |
| 9 | 156619023957 |
| 10 | 1198133817532 |
| 11 | 8153980411514 |
| 12 | 50035648469991 |
| 13 | 279906963092730 |
| 14 | 1440489290975090 |
| 15 | 6871449852708897 |
| 16 | 30577097006475471 |
| 17 | 127620952939695332 |
[20,631,19827,499474,9603489,144262866,1757594146, 17915547783,156619023957,1198133817532, 8153980411514,50035648469991,279906963092730, 1440489290975090,6871449852708897, 30577097006475471,127620952939695332] |