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| n | a(n) |
|---|---|
| 12 | 20465052608 |
| 13 | 2079913241120 |
| 14 | 104395235785256 |
| 15 | 3505018618003600 |
| 16 | 89390908732820144 |
| 17 | 1857975645023518752 |
| 18 | 32904419378927915376 |
| 19 | 511895831411154922176 |
| 20 | 7151648337964982801760 |
| 21 | 91230456810047671200128 |
| 22 | 1076401288635137599528944 |
| 23 | 11867194568934207062990560 |
[20465052608,2079913241120,104395235785256, 3505018618003600,89390908732820144, 1857975645023518752,32904419378927915376, 511895831411154922176,7151648337964982801760, 91230456810047671200128,1076401288635137599528944, 11867194568934207062990560] |