n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 7 |
5 | 42 |
6 | 245 |
7 | 1428 |
8 | 8379 |
9 | 49588 |
10 | 296010 |
11 | 1781325 |
12 | 10798788 |
13 | 65900296 |
14 | 404565252 |
15 | 2496994136 |
16 | 15486165555 |
17 | 96464124648 |
18 | 603262881620 |
19 | 3786268349115 |
20 | 23842082904255 |
21 | 150586208376450 |
22 | 953736669989985 |
[1,0,0,1,7,42,245,1428,8379,49588,296010,1781325, 10798788,65900296,404565252,2496994136, 15486165555,96464124648,603262881620, 3786268349115,23842082904255,150586208376450, 953736669989985] |