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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 204 |
| 3 | 19164 |
| 4 | 3733056 |
| 5 | 1288391040 |
| 6 | 712770186240 |
| 7 | 589563294888960 |
| 8 | 692610802412175360 |
| 9 | 1110893919113884631040 |
| 10 | 2357555468242103997235200 |
| 11 | 6453187419589244410090291200 |
| 12 | 22305345996450386267133758668800 |
[1,6,204,19164,3733056,1288391040,712770186240, 589563294888960,692610802412175360, 1110893919113884631040,2357555468242103997235200, 6453187419589244410090291200, 22305345996450386267133758668800] |