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| n | a(n) |
|---|---|
| 5 | 541 |
| 6 | 13060 |
| 7 | 195020 |
| 8 | 2327960 |
| 9 | 24418640 |
| 10 | 235804122 |
| 11 | 2152586500 |
| 12 | 18883155160 |
| 13 | 160908360260 |
| 14 | 1341800118020 |
| 15 | 11007289244964 |
| 16 | 89168468504160 |
| 17 | 715330888641680 |
| 18 | 5694960569676240 |
| 19 | 45067846839572000 |
| 20 | 354959016901129928 |
| 21 | 2785141532606257120 |
| 22 | 21787375678321712160 |
[541,13060,195020,2327960,24418640,235804122, 2152586500,18883155160,160908360260,1341800118020, 11007289244964,89168468504160,715330888641680, 5694960569676240,45067846839572000, 354959016901129928,2785141532606257120, 21787375678321712160] |