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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 59 |
| 4 | 660 |
| 5 | 9280 |
| 6 | 148300 |
| 7 | 2805900 |
| 8 | 58575000 |
| 9 | 1396365000 |
| 10 | 37435710000 |
| 11 | 1077585600000 |
| 12 | 34227953760000 |
| 13 | 1189257232800000 |
| 14 | 43680491749440000 |
| 15 | 1734759507499200000 |
| 16 | 72342732649037760000 |
| 17 | 3233001543062054400000 |
[1,7,59,660,9280,148300,2805900,58575000, 1396365000,37435710000,1077585600000, 34227953760000,1189257232800000,43680491749440000, 1734759507499200000,72342732649037760000, 3233001543062054400000] |