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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 65 |
| 3 | 56 |
| 4 | 149 |
| 5 | 1373 |
| 6 | 7823 |
| 7 | 41878 |
| 8 | 277018 |
| 9 | 1721671 |
| 10 | 10607292 |
| 11 | 67278868 |
| 12 | 424616777 |
| 13 | 2676699369 |
| 14 | 16945268476 |
| 15 | 107280325551 |
| 16 | 679285054896 |
| 17 | 4304451618590 |
| 18 | 27282048865071 |
| 19 | 172940738855024 |
| 20 | 1096476824922147 |
| 21 | 6952546132868710 |
[1,65,56,149,1373,7823,41878,277018,1721671, 10607292,67278868,424616777,2676699369, 16945268476,107280325551,679285054896, 4304451618590,27282048865071,172940738855024, 1096476824922147,6952546132868710] |