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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 274 |
| 3 | 118124 |
| 4 | 105258076 |
| 5 | 159721605680 |
| 6 | 369012649234384 |
| 7 | 1206647803780373360 |
| 8 | 5304713715525445812976 |
| 9 | 30180059720580991603896800 |
| 10 | 215760462268683520394805979744 |
| 11 | 1893448925578239663637174767335168 |
| 12 | 20012008248418194052035539503977759232 |
[1,2,274,118124,105258076,159721605680, 369012649234384,1206647803780373360, 5304713715525445812976,30180059720580991603896800, 215760462268683520394805979744, 1893448925578239663637174767335168, 20012008248418194052035539503977759232] |