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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3432 |
| 3 | 399072960 |
| 4 | 472518347558400 |
| 5 | 3177459078523411968000 |
| 6 | 85722533226982363751829504000 |
| 7 | 7363615666157189603982585462030336000 |
| 8 | 1707750599894443404262670865631874246246400000 |
[1,1,3432,399072960,472518347558400, 3177459078523411968000, 85722533226982363751829504000, 7363615666157189603982585462030336000, 1707750599894443404262670865631874246246400000] |