n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 6 |
3 | 31 |
4 | 181 |
5 | 931 |
6 | 5431 |
7 | 27931 |
8 | 159806 |
9 | 834806 |
10 | 4697306 |
11 | 24478556 |
12 | 137931681 |
13 | 717306681 |
14 | 3989650431 |
15 | 20958791056 |
16 | 115494337931 |
17 | 604881056681 |
18 | 3333662306681 |
19 | 17439531447306 |
20 | 95396181837931 |
21 | 501716543166056 |
22 | 2725636758009806 |
23 | 14311071572462931 |
24 | 77793648720900431 |
[1,1,6,31,181,931,5431,27931,159806,834806, 4697306,24478556,137931681,717306681,3989650431, 20958791056,115494337931,604881056681, 3333662306681,17439531447306,95396181837931, 501716543166056,2725636758009806, 14311071572462931,77793648720900431] |