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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 40 |
| 3 | 5040 |
| 4 | 24192 |
| 5 | 39916800 |
| 6 | 6227020800 |
| 7 | 37362124800 |
| 8 | 355687428096000 |
| 9 | 24329020081766400 |
| 10 | 51090942171709440000 |
| 11 | 2872446304320552960000 |
| 12 | 5170403347776995328000000 |
| 13 | 2177773890083670432153600000 |
| 14 | 8841761993739701954543616000000 |
| 15 | 249176928914482509628047360000000 |
[1,6,40,5040,24192,39916800,6227020800, 37362124800,355687428096000,24329020081766400, 51090942171709440000,2872446304320552960000, 5170403347776995328000000, 2177773890083670432153600000, 8841761993739701954543616000000, 249176928914482509628047360000000] |