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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 32 |
| 5 | 1422 |
| 6 | 146720 |
| 7 | 18258864 |
| 8 | 3217515264 |
| 9 | 910849979232 |
| 10 | 316878962588928 |
| 11 | 143616562358849280 |
| 12 | 90359341652805156864 |
| 13 | 68004478547050644357120 |
| 14 | 63187026071337208000512000 |
| 15 | 75392341069747600992153600000 |
| 16 | 104962910849766568886449582080000 |
| 17 | 174017685915978467201007058206720000 |
[1,0,0,1,32,1422,146720,18258864,3217515264, 910849979232,316878962588928,143616562358849280, 90359341652805156864,68004478547050644357120, 63187026071337208000512000, 75392341069747600992153600000, 104962910849766568886449582080000, 174017685915978467201007058206720000] |