n | a(n) |
---|---|
0 | 1 |
1 | 9 |
2 | 44 |
3 | 207 |
4 | 991 |
5 | 4752 |
6 | 22769 |
7 | 109089 |
8 | 522676 |
9 | 2504295 |
10 | 11998799 |
11 | 57489696 |
12 | 275449681 |
13 | 1319758713 |
14 | 6323343884 |
15 | 30296960703 |
16 | 145161459631 |
17 | 695510337456 |
18 | 3332390227649 |
19 | 15966440800785 |
20 | 76499813776276 |
21 | 366532628080599 |
[1,9,44,207,991,4752,22769,109089,522676,2504295, 11998799,57489696,275449681,1319758713,6323343884, 30296960703,145161459631,695510337456, 3332390227649,15966440800785,76499813776276, 366532628080599] |