n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 3 |
4 | 9 |
5 | 35 |
6 | 195 |
7 | 1218 |
8 | 9184 |
9 | 75492 |
10 | 724995 |
11 | 7428905 |
12 | 86414559 |
13 | 1059030297 |
14 | 14455096201 |
15 | 206132138310 |
16 | 3228219898080 |
17 | 52501425954872 |
18 | 927663133292361 |
19 | 16944154401198843 |
20 | 333387373140423145 |
21 | 6756756713150677275 |
22 | 146490980301083247291 |
[0,0,1,3,9,35,195,1218,9184,75492,724995,7428905, 86414559,1059030297,14455096201,206132138310, 3228219898080,52501425954872,927663133292361, 16944154401198843,333387373140423145, 6756756713150677275,146490980301083247291] |