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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 204 |
| 3 | 510718 |
| 4 | 31008619522 |
| 5 | 43911490791183200 |
| 6 | 1424639466911800364132674 |
| 7 | 1048492580133908850434091619741314 |
[1,2,204,510718,31008619522,43911490791183200, 1424639466911800364132674, 1048492580133908850434091619741314] |