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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 432 |
| 3 | 82944 |
| 4 | 41472000 |
| 5 | 44789760000 |
| 6 | 92177326080000 |
| 7 | 330363536670720000 |
| 8 | 1926680145863639040000 |
| 9 | 17340121312772751360000000 |
| 10 | 230797014673005320601600000000 |
| 11 | 4386989654904485133995212800000000 |
| 12 | 115658595261901846072649790259200000000 |
[1,8,432,82944,41472000,44789760000, 92177326080000,330363536670720000, 1926680145863639040000,17340121312772751360000000, 230797014673005320601600000000, 4386989654904485133995212800000000, 115658595261901846072649790259200000000] |