n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 9 |
3 | 50 |
4 | 292 |
5 | 1757 |
6 | 10809 |
7 | 67473 |
8 | 425711 |
9 | 2707757 |
10 | 17332058 |
11 | 111508304 |
12 | 720429774 |
13 | 4670990039 |
14 | 30375989547 |
15 | 198050065342 |
16 | 1294186149138 |
17 | 8473767434587 |
18 | 55579644024480 |
19 | 365116858320540 |
20 | 2401901294047629 |
21 | 15820713708790749 |
22 | 104326220133691996 |
[1,2,9,50,292,1757,10809,67473,425711,2707757, 17332058,111508304,720429774,4670990039, 30375989547,198050065342,1294186149138, 8473767434587,55579644024480,365116858320540, 2401901294047629,15820713708790749, 104326220133691996] |