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| n | a(n) |
|---|---|
| 8 | 2520 |
| 9 | 30240 |
| 10 | 226800 |
| 11 | 1367520 |
| 12 | 7271880 |
| 13 | 35692800 |
| 14 | 165957792 |
| 15 | 742822080 |
| 16 | 3234711480 |
| 17 | 13803744864 |
| 18 | 58021888080 |
| 19 | 241116750624 |
| 20 | 993313349544 |
| 21 | 4064913201216 |
| 22 | 16549636147968 |
| 23 | 67112688842496 |
| 24 | 271323921459096 |
| 25 | 1094303232174240 |
| 26 | 4405390451382960 |
| 27 | 17709538489849440 |
[2520,30240,226800,1367520,7271880,35692800, 165957792,742822080,3234711480,13803744864, 58021888080,241116750624,993313349544, 4064913201216,16549636147968,67112688842496, 271323921459096,1094303232174240,4405390451382960, 17709538489849440] |