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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 80 |
| 2 | 5616 |
| 3 | 378880 |
| 4 | 25108976 |
| 5 | 1647924480 |
| 6 | 107513168896 |
| 7 | 6986714808320 |
| 8 | 452774526525936 |
| 9 | 29282607270465280 |
| 10 | 1890903981075228416 |
| 11 | 121957594044379545600 |
| 12 | 7858392761937306551296 |
| 13 | 505967049989822738186240 |
| 14 | 32556176323125901615005696 |
| 15 | 2093691733876474661699584000 |
[1,80,5616,378880,25108976,1647924480, 107513168896,6986714808320,452774526525936, 29282607270465280,1890903981075228416, 121957594044379545600,7858392761937306551296, 505967049989822738186240, 32556176323125901615005696, 2093691733876474661699584000] |