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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 92 |
| 3 | 5272 |
| 4 | 567440 |
| 5 | 98979200 |
| 6 | 25530690624 |
| 7 | 9147312168576 |
| 8 | 4349983363258624 |
| 9 | 2652517304182955008 |
| 10 | 2018610268528861424640 |
| 11 | 1875904660571518053251072 |
| 12 | 2091013498538531655993561088 |
[1,4,92,5272,567440,98979200,25530690624, 9147312168576,4349983363258624, 2652517304182955008,2018610268528861424640, 1875904660571518053251072, 2091013498538531655993561088] |