n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 19 |
5 | 71 |
6 | 300 |
7 | 1370 |
8 | 6563 |
9 | 32272 |
10 | 161700 |
11 | 820166 |
12 | 4198764 |
13 | 21647353 |
14 | 112262033 |
15 | 585049063 |
16 | 3061951973 |
17 | 16084816384 |
18 | 84773694223 |
[1,1,2,6,19,71,300,1370,6563,32272,161700,820166, 4198764,21647353,112262033,585049063,3061951973, 16084816384,84773694223] |