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| n | a(n) |
|---|---|
| 1 | 64 |
| 2 | 719 |
| 3 | 2208 |
| 4 | 8254 |
| 5 | 68338 |
| 6 | 380640 |
| 7 | 1802240 |
| 8 | 12149499 |
| 9 | 76809028 |
| 10 | 414339658 |
| 11 | 2506312732 |
| 12 | 15834976447 |
| 13 | 91945106122 |
| 14 | 542541369889 |
| 15 | 3341140747840 |
| 16 | 19987650956102 |
| 17 | 118370747871295 |
| 18 | 716642725644643 |
| 19 | 4320134327579730 |
[64,719,2208,8254,68338,380640,1802240,12149499, 76809028,414339658,2506312732,15834976447, 91945106122,542541369889,3341140747840, 19987650956102,118370747871295,716642725644643, 4320134327579730] |