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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 4 |
| 2 | 8 |
| 3 | 32 |
| 4 | 192 |
| 5 | 1536 |
| 6 | 15360 |
| 7 | 184320 |
| 8 | 2580480 |
| 9 | 41287680 |
| 10 | 743178240 |
| 11 | 14863564800 |
| 12 | 326998425600 |
| 13 | 7847962214400 |
| 14 | 204047017574400 |
| 15 | 5713316492083200 |
| 16 | 171399494762496000 |
| 17 | 5484783832399872000 |
| 18 | 186482650301595648000 |
| 19 | 6713375410857443328000 |
[2,4,8,32,192,1536,15360,184320,2580480,41287680, 743178240,14863564800,326998425600,7847962214400, 204047017574400,5713316492083200, 171399494762496000,5484783832399872000, 186482650301595648000,6713375410857443328000] |