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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 16 |
| 3 | 672 |
| 4 | 39936 |
| 5 | 3624960 |
| 6 | 478955520 |
| 7 | 87177646080 |
| 8 | 20922779566080 |
| 9 | 6402373519933440 |
| 10 | 2432902004460748800 |
| 11 | 1124000727695858073600 |
| 12 | 620448401731277448806400 |
| 13 | 403291461126554623829606400 |
| 14 | 304888344611712432172380979200 |
| 15 | 265252859812191015786434789376000 |
[0,0,16,672,39936,3624960,478955520,87177646080, 20922779566080,6402373519933440, 2432902004460748800,1124000727695858073600, 620448401731277448806400, 403291461126554623829606400, 304888344611712432172380979200, 265252859812191015786434789376000] |