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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 8 |
| 3 | 900 |
| 4 | 224112 |
| 5 | 78775200 |
| 6 | 40518181440 |
| 7 | 28340179227360 |
| 8 | 26078095792869120 |
| 9 | 30544708065077606400 |
| 10 | 44428404658605222528000 |
| 11 | 78604530683773395984883200 |
| 12 | 166295474965751756924207462400 |
| 13 | 414658685362517268992110471680000 |
| 14 | 1203746810444949373635048911870976000 |
[1,0,8,900,224112,78775200,40518181440, 28340179227360,26078095792869120, 30544708065077606400,44428404658605222528000, 78604530683773395984883200, 166295474965751756924207462400, 414658685362517268992110471680000, 1203746810444949373635048911870976000] |