n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 5 |
4 | 16 |
5 | 55 |
6 | 225 |
7 | 949 |
8 | 4269 |
9 | 19500 |
10 | 91115 |
11 | 429742 |
12 | 2047660 |
13 | 9820197 |
14 | 47383255 |
15 | 229725560 |
16 | 1118568692 |
17 | 5466616025 |
18 | 26804560282 |
19 | 131817042605 |
20 | 649952289243 |
[1,2,5,16,55,225,949,4269,19500,91115,429742, 2047660,9820197,47383255,229725560,1118568692, 5466616025,26804560282,131817042605,649952289243] |