n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 12 |
6 | 56 |
7 | 456 |
8 | 6880 |
9 | 191536 |
10 | 9733056 |
11 | 903753248 |
12 | 154108311168 |
13 | 48542114686912 |
14 | 28401423719122304 |
15 | 31021002160355166848 |
16 | 63530415842308265100288 |
17 | 244912778438520759443245824 |
18 | 1783398846284777975419600287232 |
19 | 24605641171260376770598003978281472 |
[1,1,1,2,4,12,56,456,6880,191536,9733056, 903753248,154108311168,48542114686912, 28401423719122304,31021002160355166848, 63530415842308265100288, 244912778438520759443245824, 1783398846284777975419600287232, 24605641171260376770598003978281472] |