n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 7 |
3 | 30 |
4 | 146 |
5 | 772 |
6 | 4331 |
7 | 25398 |
8 | 154158 |
9 | 961820 |
10 | 6137734 |
11 | 39909740 |
12 | 263665252 |
13 | 1765815560 |
14 | 11966535091 |
15 | 81937361702 |
16 | 566185489878 |
17 | 3944202596652 |
18 | 27676632525362 |
19 | 195481707009220 |
20 | 1388890568962556 |
[1,2,7,30,146,772,4331,25398,154158,961820, 6137734,39909740,263665252,1765815560,11966535091, 81937361702,566185489878,3944202596652, 27676632525362,195481707009220,1388890568962556] |