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| n | a(n) |
|---|---|
| 1 | 42 |
| 2 | 1764 |
| 3 | 6216 |
| 4 | 35952 |
| 5 | 185136 |
| 6 | 1006572 |
| 7 | 5346600 |
| 8 | 28935984 |
| 9 | 154692048 |
| 10 | 835671396 |
| 11 | 4480109592 |
| 12 | 24171724080 |
| 13 | 129787001904 |
| 14 | 699638944620 |
| 15 | 3760020085080 |
| 16 | 20257347370848 |
| 17 | 108927000309120 |
| 18 | 586630343266884 |
| 19 | 3155460147857976 |
[42,1764,6216,35952,185136,1006572,5346600, 28935984,154692048,835671396,4480109592, 24171724080,129787001904,699638944620, 3760020085080,20257347370848,108927000309120, 586630343266884,3155460147857976] |