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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 8 |
| 3 | 152 |
| 4 | 5664 |
| 5 | 399376 |
| 6 | 53846016 |
| 7 | 14141384704 |
| 8 | 7330134466560 |
| 9 | 7551251740344320 |
| 10 | 15510852680588984320 |
| 11 | 63626087316632048238592 |
| 12 | 521607805205244557347782656 |
| 13 | 8549156556447111748331767857152 |
[1,1,8,152,5664,399376,53846016,14141384704, 7330134466560,7551251740344320, 15510852680588984320,63626087316632048238592, 521607805205244557347782656, 8549156556447111748331767857152] |