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| n | a(n) |
|---|---|
| 4 | 14 |
| 5 | 420 |
| 6 | 8580 |
| 7 | 150150 |
| 8 | 2432430 |
| 9 | 37777740 |
| 10 | 572827580 |
| 11 | 8568059500 |
| 12 | 127199546012 |
| 13 | 1881416537000 |
| 14 | 27792098497800 |
| 15 | 410634370077750 |
| 16 | 6074408847920670 |
| 17 | 90017212151219100 |
| 18 | 1336818529866319500 |
| 19 | 19898794932394570500 |
| 20 | 296909055625560798420 |
| 21 | 4440849374395184751000 |
[14,420,8580,150150,2432430,37777740,572827580, 8568059500,127199546012,1881416537000, 27792098497800,410634370077750,6074408847920670, 90017212151219100,1336818529866319500, 19898794932394570500,296909055625560798420, 4440849374395184751000] |