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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 138458880 |
| 7 | 15482327040 |
| 8 | 973804265280 |
| 9 | 37527682805760 |
| 10 | 983531592449280 |
| 11 | 18878469131612160 |
| 12 | 280164494820672000 |
| 13 | 3349945087383121920 |
| 14 | 33324456406105624320 |
| 15 | 282893511597411778560 |
| 16 | 2091767439982358658240 |
[1,0,0,0,0,0,138458880,15482327040,973804265280, 37527682805760,983531592449280,18878469131612160, 280164494820672000,3349945087383121920, 33324456406105624320,282893511597411778560, 2091767439982358658240] |