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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 12 |
| 3 | 432 |
| 4 | 61344 |
| 5 | 32866560 |
| 6 | 68307743232 |
| 7 | 561981464819712 |
| 8 | 18437720675374485504 |
| 9 | 2417519433343618432696320 |
| 10 | 1267602236528793479228867346432 |
| 11 | 2658428102191640176274135259655176192 |
| 12 | 22300681394917309655766001890404571062206464 |
[1,2,12,432,61344,32866560,68307743232, 561981464819712,18437720675374485504, 2417519433343618432696320, 1267602236528793479228867346432, 2658428102191640176274135259655176192, 22300681394917309655766001890404571062206464] |