n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 8 |
3 | 36 |
4 | 174 |
5 | 888 |
6 | 4716 |
7 | 25808 |
8 | 144568 |
9 | 825030 |
10 | 4780176 |
11 | 28045860 |
12 | 166295716 |
13 | 994959560 |
14 | 5999349896 |
15 | 36420226288 |
16 | 222415222446 |
17 | 1365445230212 |
18 | 8422174103796 |
19 | 52168047039764 |
20 | 324366739546304 |
21 | 2023789526326096 |
[1,2,8,36,174,888,4716,25808,144568,825030, 4780176,28045860,166295716,994959560,5999349896, 36420226288,222415222446,1365445230212, 8422174103796,52168047039764,324366739546304, 2023789526326096] |