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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 12 |
| 2 | 4410 |
| 3 | 7560000 |
| 4 | 35626991400 |
| 5 | 357082280755200 |
| 6 | 6536573599765809600 |
| 7 | 197543239414923257856000 |
| 8 | 9172025443146972656250000000 |
| 9 | 619972004905097945232074342400000 |
| 10 | 58507834434071888178873434004530400000 |
| 11 | 7455351156359319047773396236777475276800000 |
[1,12,4410,7560000,35626991400,357082280755200, 6536573599765809600,197543239414923257856000, 9172025443146972656250000000, 619972004905097945232074342400000, 58507834434071888178873434004530400000, 7455351156359319047773396236777475276800000] |