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| n | a(n) |
|---|---|
| 7 | 13 |
| 8 | 2835 |
| 9 | 281792 |
| 10 | 19443460 |
| 11 | 1103826822 |
| 12 | 56255485594 |
| 13 | 2706219574700 |
| 14 | 126736375104144 |
| 15 | 5893207936217567 |
| 16 | 275625849530635937 |
| 17 | 13077128859847095120 |
| 18 | 632973909637081784520 |
| 19 | 31373163306972014925324 |
| 20 | 1596165353981611633618164 |
| 21 | 83483538804312370741567896 |
[13,2835,281792,19443460,1103826822,56255485594, 2706219574700,126736375104144,5893207936217567, 275625849530635937,13077128859847095120, 632973909637081784520,31373163306972014925324, 1596165353981611633618164, 83483538804312370741567896] |