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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 32 |
| 5 | 178 |
| 6 | 1164 |
| 7 | 8748 |
| 8 | 74304 |
| 9 | 704016 |
| 10 | 7362720 |
| 11 | 84255840 |
| 12 | 1047358080 |
| 13 | 14054739840 |
| 14 | 202514376960 |
| 15 | 3118666924800 |
| 16 | 51119166873600 |
| 17 | 888640952371200 |
| 18 | 16330301780889600 |
| 19 | 316322420114534400 |
| 20 | 6441691128993792000 |
| 21 | 137586770616637440000 |
| 22 | 3075566993729556480000 |
[1,2,7,32,178,1164,8748,74304,704016,7362720, 84255840,1047358080,14054739840,202514376960, 3118666924800,51119166873600,888640952371200, 16330301780889600,316322420114534400, 6441691128993792000,137586770616637440000, 3075566993729556480000] |