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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 10 |
| 3 | 190 |
| 4 | 5320 |
| 5 | 196840 |
| 6 | 9054640 |
| 7 | 498005200 |
| 8 | 31872332800 |
| 9 | 2326680294400 |
| 10 | 190787784140800 |
| 11 | 17361688356812800 |
| 12 | 1736168835681280000 |
| 13 | 189242403089259520000 |
| 14 | 22330603564532623360000 |
| 15 | 2835986652695643166720000 |
| 16 | 385694184766607470673920000 |
| 17 | 55925656791158083247718400000 |
[1,1,10,190,5320,196840,9054640,498005200, 31872332800,2326680294400,190787784140800, 17361688356812800,1736168835681280000, 189242403089259520000,22330603564532623360000, 2835986652695643166720000, 385694184766607470673920000, 55925656791158083247718400000] |