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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 12 |
| 2 | 273 |
| 3 | 25520 |
| 4 | 6778629 |
| 5 | 5132148528 |
| 6 | 11368775698280 |
| 7 | 74897449398451680 |
| 8 | 1476178370884382958936 |
| 9 | 87205387550224830516286800 |
| 10 | 15450442981642705273095610563240 |
| 11 | 8211400746584626963688710296061894800 |
[1,12,273,25520,6778629,5132148528,11368775698280, 74897449398451680,1476178370884382958936, 87205387550224830516286800, 15450442981642705273095610563240, 8211400746584626963688710296061894800] |