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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 600 |
| 3 | 2600 |
| 4 | 15996 |
| 5 | 2460800 |
| 6 | 10652800 |
| 7 | 65552004 |
| 8 | 10084355800 |
| 9 | 43655173800 |
| 10 | 268632095996 |
| 11 | 41325687609600 |
| 12 | 178898891577600 |
| 13 | 1100854263840004 |
| 14 | 169352657739783000 |
| 15 | 733127614029833000 |
| 16 | 4511300504584239996 |
| 17 | 694007150091943126400 |
[4,600,2600,15996,2460800,10652800,65552004, 10084355800,43655173800,268632095996, 41325687609600,178898891577600,1100854263840004, 169352657739783000,733127614029833000, 4511300504584239996,694007150091943126400] |