n | a(n) |
---|---|
3 | 1 |
4 | 2 |
5 | 5 |
6 | 20 |
7 | 87 |
8 | 616 |
9 | 4843 |
10 | 44128 |
11 | 444621 |
12 | 4936274 |
13 | 59661265 |
14 | 780547332 |
15 | 10987097799 |
16 | 165587196328 |
17 | 2660378564791 |
18 | 45392026278108 |
19 | 819716784789209 |
20 | 15620011000052754 |
21 | 313219935456572497 |
22 | 6593238656843759572 |
[1,2,5,20,87,616,4843,44128,444621,4936274, 59661265,780547332,10987097799,165587196328, 2660378564791,45392026278108,819716784789209, 15620011000052754,313219935456572497, 6593238656843759572] |