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| n | a(n) |
|---|---|
| 5 | 2 |
| 6 | 12 |
| 7 | 30 |
| 8 | 240 |
| 9 | 720 |
| 10 | 60480 |
| 11 | 60480 |
| 12 | 7983360 |
| 13 | 1108800 |
| 14 | 518918400 |
| 15 | 21794572800 |
| 16 | 62270208000 |
| 17 | 87178291200 |
| 18 | 35568742809600 |
| 19 | 2 |
| 20 | 40548366802944000 |
| 21 | 304112751022080000 |
| 22 | 851515702861824000 |
| 23 | 2534272925184000 |
| 24 | 5170403347776995328000 |
| 25 | 51704033477769953280000 |
[2,12,30,240,720,60480,60480,7983360,1108800, 518918400,21794572800,62270208000,87178291200, 35568742809600,2,40548366802944000, 304112751022080000,851515702861824000, 2534272925184000,5170403347776995328000, 51704033477769953280000] |