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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 105 |
| 3 | 41580 |
| 4 | 184225041 |
| 5 | 9095857138368 |
| 6 | 4995284546047230864 |
| 7 | 30483011847732623089267500 |
| 8 | 2065715788914012182693991725390625 |
| 9 | 1553908887541345830681718185939775035000000 |
| 10 | 12971921694089364427957671958722080861704163596800000 |
[1,3,105,41580,184225041,9095857138368, 4995284546047230864,30483011847732623089267500, 2065715788914012182693991725390625, 1553908887541345830681718185939775035000000, 12971921694089364427957671958722080861704163596800\ 000] |