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| n | a(n) |
|---|---|
| 5 | 120 |
| 6 | 691020 |
| 7 | 128047374 |
| 8 | 6519340912 |
| 9 | 156097542888 |
| 10 | 2259242749800 |
| 11 | 22815705739244 |
| 12 | 175939638868224 |
| 13 | 1099964624581680 |
| 14 | 5812510584460580 |
| 15 | 26753072198342490 |
| 16 | 109684475412107232 |
| 17 | 407515671392921520 |
| 18 | 1390695205822539984 |
| 19 | 4406577363489470616 |
| 20 | 13079027432832437440 |
[120,691020,128047374,6519340912,156097542888, 2259242749800,22815705739244,175939638868224, 1099964624581680,5812510584460580, 26753072198342490,109684475412107232, 407515671392921520,1390695205822539984, 4406577363489470616,13079027432832437440] |