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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 48 |
| 4 | 1232 |
| 5 | 69944 |
| 6 | 8897744 |
| 7 | 2543744944 |
| 8 | 1632807480048 |
| 9 | 2350761948259496 |
| 10 | 7595900369159613200 |
| 11 | 55087633557679363709984 |
| 12 | 896577592582670794898595216 |
[1,4,48,1232,69944,8897744,2543744944, 1632807480048,2350761948259496, 7595900369159613200,55087633557679363709984, 896577592582670794898595216] |