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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 48 |
| 2 | 624 |
| 3 | 1872 |
| 4 | 215280 |
| 5 | 1506960 |
| 6 | 16576560 |
| 7 | 39369330 |
| 8 | 564293730 |
| 9 | 9028699680 |
| 10 | 478521083040 |
| 11 | 4625703802720 |
| 12 | 41631334224480 |
| 13 | 707732681816160 |
| 14 | 51664485772579680 |
| 15 | 25832242886289840 |
| 16 | 2144076159562056720 |
| 17 | 357346026593676120 |
| 18 | 3692575608134653240 |
| 19 | 2584802925694257268 |
[3,48,624,1872,215280,1506960,16576560,39369330, 564293730,9028699680,478521083040,4625703802720, 41631334224480,707732681816160,51664485772579680, 25832242886289840,2144076159562056720, 357346026593676120,3692575608134653240, 2584802925694257268] |