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| n | a(n) |
|---|---|
| 1 | 64 |
| 2 | 576 |
| 3 | 5074 |
| 4 | 44948 |
| 5 | 397734 |
| 6 | 3520628 |
| 7 | 31161462 |
| 8 | 275819644 |
| 9 | 2441352670 |
| 10 | 21609092620 |
| 11 | 191268034094 |
| 12 | 1692966274828 |
| 13 | 14984912401894 |
| 14 | 132635602320228 |
| 15 | 1173994381706142 |
| 16 | 10391348815984084 |
| 17 | 91976700981777710 |
| 18 | 814111206705377460 |
[64,576,5074,44948,397734,3520628,31161462, 275819644,2441352670,21609092620,191268034094, 1692966274828,14984912401894,132635602320228, 1173994381706142,10391348815984084, 91976700981777710,814111206705377460] |