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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 4 |
| 2 | 352 |
| 3 | 205952 |
| 4 | 909622784 |
| 5 | 31295082653696 |
| 6 | 8484952062010458112 |
| 7 | 18227547762157700745396224 |
| 8 | 311174877767551886508446611406848 |
| 9 | 42294654497199437221532169279178468753408 |
| 10 | 45827231806117374257502404342058904364252227698688 |
| 11 | 396204754408958726445756226789038664515203519656360012677120 |
[0,4,352,205952,909622784,31295082653696, 8484952062010458112,18227547762157700745396224, 311174877767551886508446611406848, 42294654497199437221532169279178468753408, 45827231806117374257502404342058904364252227698688\ , 39620475440895872644575622678903866451520351965636\ 0012677120] |