n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 1 |
4 | 4 |
5 | 11 |
6 | 71 |
7 | 372 |
8 | 2850 |
9 | 21121 |
10 | 191077 |
11 | 1793078 |
12 | 19037624 |
13 | 214051059 |
14 | 2628723267 |
15 | 34285658032 |
16 | 479609321326 |
17 | 7104125711717 |
18 | 111655209047393 |
19 | 1849927197690186 |
20 | 32289686161489668 |
[0,1,1,4,11,71,372,2850,21121,191077,1793078, 19037624,214051059,2628723267,34285658032, 479609321326,7104125711717,111655209047393, 1849927197690186,32289686161489668] |