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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 10 |
| 3 | 390 |
| 4 | 33456 |
| 5 | 4845360 |
| 6 | 1059099840 |
| 7 | 325460948400 |
| 8 | 133697543616000 |
| 9 | 70733019878196480 |
| 10 | 46831083260349024000 |
| 11 | 37927830201482962540800 |
| 12 | 36883442511877368877747200 |
| 13 | 42409212946187708288828160000 |
[1,1,10,390,33456,4845360,1059099840,325460948400, 133697543616000,70733019878196480, 46831083260349024000,37927830201482962540800, 36883442511877368877747200, 42409212946187708288828160000] |