n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 5 |
4 | 27 |
5 | 129 |
6 | 761 |
7 | 5137 |
8 | 40695 |
9 | 363815 |
10 | 3632629 |
11 | 39927183 |
12 | 479047667 |
13 | 6227155921 |
14 | 87178936305 |
15 | 1307676395009 |
16 | 20922800209903 |
17 | 355687462555407 |
18 | 6402373891522541 |
19 | 121645101063561055 |
20 | 2432902011892531179 |
[1,0,1,5,27,129,761,5137,40695,363815,3632629, 39927183,479047667,6227155921,87178936305, 1307676395009,20922800209903,355687462555407, 6402373891522541,121645101063561055, 2432902011892531179] |