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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 10 |
| 3 | 315 |
| 4 | 2520 |
| 5 | 49896 |
| 6 | 97297200 |
| 7 | 638512875 |
| 8 | 126309456000 |
| 9 | 47517617347200 |
| 10 | 2934911659680000 |
| 11 | 105192125402364000 |
| 12 | 1178623253808000000 |
| 13 | 1329207696584271504000000 |
| 14 | 77094046401887747232000000 |
| 15 | 10455880043256025718340000000 |
| 16 | 6973521679375808310673920000000 |
[1,3,10,315,2520,49896,97297200,638512875, 126309456000,47517617347200,2934911659680000, 105192125402364000,1178623253808000000, 1329207696584271504000000, 77094046401887747232000000, 10455880043256025718340000000, 6973521679375808310673920000000] |