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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 28 |
| 3 | 3740 |
| 4 | 1161678 |
| 5 | 741215012 |
| 6 | 840790914296 |
| 7 | 1439884504332480 |
| 8 | 3576753835657635164 |
| 9 | 12524266750764601753576 |
| 10 | 59517682037036901339560926 |
| 11 | 363169855509323114958694015304 |
| 12 | 2774932810808589820997792848479674 |
| 13 | 26216044235174202943266623056680424524 |
[1,1,28,3740,1161678,741215012,840790914296, 1439884504332480,3576753835657635164, 12524266750764601753576, 59517682037036901339560926, 363169855509323114958694015304, 2774932810808589820997792848479674, 26216044235174202943266623056680424524] |