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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 24 |
| 3 | 928 |
| 4 | 224096 |
| 5 | 180925632 |
| 6 | 915592324864 |
| 7 | 15519120649837568 |
| 8 | 1649093881865807133696 |
| 9 | 586980815917441872922703872 |
| 10 | 1309843539264798142345101012967424 |
| 11 | 9790772765676733007363874643686313525248 |
[1,2,24,928,224096,180925632,915592324864, 15519120649837568,1649093881865807133696, 586980815917441872922703872, 1309843539264798142345101012967424, 9790772765676733007363874643686313525248] |