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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 4 |
| 3 | 756 |
| 4 | 1729728 |
| 5 | 140229804000 |
| 6 | 752239365180732000 |
| 7 | 419014989521191873479589920 |
| 8 | 34623595988556658225393154134784716800 |
| 9 | 571228532851873223553288547443139274046846826752000 |
[0,4,756,1729728,140229804000,752239365180732000, 419014989521191873479589920, 34623595988556658225393154134784716800, 57122853285187322355328854744313927404684682675200\ 0] |