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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 160 |
| 3 | 62720 |
| 4 | 68992000 |
| 5 | 163235072000 |
| 6 | 710399033344000 |
| 7 | 5129081020743680000 |
| 8 | 57096929922918645760000 |
| 9 | 927825111247427993600000000 |
| 10 | 21095031729321522862489600000000 |
| 11 | 648714415740095471067280179200000000 |
| 12 | 26246985260844262759382156050432000000000 |
[1,2,160,62720,68992000,163235072000, 710399033344000,5129081020743680000, 57096929922918645760000, 927825111247427993600000000, 21095031729321522862489600000000, 648714415740095471067280179200000000, 26246985260844262759382156050432000000000] |