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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 72 |
| 3 | 3456 |
| 4 | 345600 |
| 5 | 62208000 |
| 6 | 18289152000 |
| 7 | 8193540096000 |
| 8 | 5309413982208000 |
| 9 | 4778472583987200000 |
| 10 | 5781951826624512000000 |
| 11 | 9158611693373227008000000 |
| 12 | 18573664514160904372224000000 |
| 13 | 47325697182081984340426752000000 |
| 14 | 149075946123558250672344268800000000 |
[1,4,72,3456,345600,62208000,18289152000, 8193540096000,5309413982208000, 4778472583987200000,5781951826624512000000, 9158611693373227008000000, 18573664514160904372224000000, 47325697182081984340426752000000, 149075946123558250672344268800000000] |