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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 36 |
| 4 | 10728 |
| 5 | 4857120 |
| 6 | 4099655520 |
| 7 | 5589688315680 |
| 8 | 11532215497783680 |
[0,2,36,10728,4857120,4099655520,5589688315680, 11532215497783680] |