n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 1 |
4 | 6 |
5 | 41 |
6 | 293 |
7 | 2309 |
8 | 19975 |
9 | 189524 |
10 | 1960041 |
11 | 21993884 |
12 | 266361634 |
13 | 3465832370 |
14 | 48245601976 |
15 | 715756932697 |
16 | 11277786883720 |
17 | 188135296651083 |
18 | 3313338641692957 |
19 | 61444453534759589 |
20 | 1196988740015236617 |
21 | 24442368179977776766 |
22 | 522124104504306695929 |
[0,0,1,6,41,293,2309,19975,189524,1960041, 21993884,266361634,3465832370,48245601976, 715756932697,11277786883720,188135296651083, 3313338641692957,61444453534759589, 1196988740015236617,24442368179977776766, 522124104504306695929] |