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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 24 |
| 3 | 776 |
| 4 | 79840 |
| 5 | 35397440 |
| 6 | 69619053504 |
| 7 | 564929183555840 |
| 8 | 18464894708236907776 |
| 9 | 2418517115222622481308160 |
| 10 | 1267747370909677813160722947072 |
| 11 | 2658511777246500251150215101758228480 |
| 12 | 22300872810108738542496498718468714032205824 |
[1,2,24,776,79840,35397440,69619053504, 564929183555840,18464894708236907776, 2418517115222622481308160, 1267747370909677813160722947072, 2658511777246500251150215101758228480, 22300872810108738542496498718468714032205824] |