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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 50 |
| 3 | 1440 |
| 4 | 215760 |
| 5 | 11218000 |
| 6 | 8859219696 |
| 7 | 549669946784 |
| 8 | 797599992178688 |
| 9 | 195297824029876992 |
| 10 | 225830701916170080000 |
| 11 | 33538442785393084937728 |
| 12 | 478648537323384927696592896 |
| 13 | 26649057768458576467019134976 |
| 14 | 207869233649005397144301933676544 |
[1,2,50,1440,215760,11218000,8859219696, 549669946784,797599992178688,195297824029876992, 225830701916170080000,33538442785393084937728, 478648537323384927696592896, 26649057768458576467019134976, 207869233649005397144301933676544] |