n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 4 |
3 | 14 |
4 | 76 |
5 | 532 |
6 | 4534 |
7 | 46370 |
8 | 559976 |
9 | 7845848 |
10 | 125535274 |
11 | 2265367678 |
12 | 45665532796 |
13 | 1020237666788 |
14 | 25091295382430 |
15 | 675201440266298 |
16 | 19774424397547216 |
17 | 627298393163258800 |
18 | 21464382547813040722 |
19 | 789234852942189435638 |
20 | 31079114556571478567396 |
[1,2,4,14,76,532,4534,46370,559976,7845848, 125535274,2265367678,45665532796,1020237666788, 25091295382430,675201440266298,19774424397547216, 627298393163258800,21464382547813040722, 789234852942189435638,31079114556571478567396] |