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| n | a(n) |
|---|---|
| 5 | 960 |
| 6 | 838130 |
| 7 | 71331470 |
| 8 | 2134043800 |
| 9 | 33969932808 |
| 10 | 353530511420 |
| 11 | 2710992616420 |
| 12 | 16512265636680 |
| 13 | 83974746129560 |
| 14 | 369225271340926 |
| 15 | 1439572248244130 |
| 16 | 5072665106738320 |
| 17 | 16393720098232880 |
| 18 | 49158099955813080 |
| 19 | 138052747638032104 |
| 20 | 365886966555545840 |
| 21 | 920991546926843280 |
[960,838130,71331470,2134043800,33969932808, 353530511420,2710992616420,16512265636680, 83974746129560,369225271340926,1439572248244130, 5072665106738320,16393720098232880, 49158099955813080,138052747638032104, 365886966555545840,920991546926843280] |