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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 96 |
| 3 | 5664 |
| 4 | 622720 |
| 5 | 110002304 |
| 6 | 28499801088 |
| 7 | 10180961396480 |
| 8 | 4796029025538048 |
| 9 | 2880634827782397952 |
| 10 | 2148613628413055418368 |
| 11 | 1948442293941619438944256 |
| 12 | 2111126262325896262110150656 |
[1,4,96,5664,622720,110002304,28499801088, 10180961396480,4796029025538048, 2880634827782397952,2148613628413055418368, 1948442293941619438944256, 2111126262325896262110150656] |