n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 8 |
3 | 42 |
4 | 260 |
5 | 1816 |
6 | 13962 |
7 | 116094 |
8 | 1029124 |
9 | 9609144 |
10 | 93569808 |
11 | 942642696 |
12 | 9763181946 |
13 | 103455616400 |
14 | 1117379189926 |
15 | 12264816349938 |
16 | 136501928050116 |
17 | 1537591374945704 |
18 | 17503603786398576 |
19 | 201128739609458904 |
20 | 2330480521265639136 |
[1,2,8,42,260,1816,13962,116094,1029124,9609144, 93569808,942642696,9763181946,103455616400, 1117379189926,12264816349938,136501928050116, 1537591374945704,17503603786398576, 201128739609458904,2330480521265639136] |