n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 2 |
5 | 9 |
6 | 50 |
7 | 318 |
8 | 2310 |
9 | 19060 |
10 | 176310 |
11 | 1807181 |
12 | 20330788 |
13 | 249052161 |
14 | 3299941145 |
15 | 47024161317 |
16 | 717118460090 |
17 | 11653174976468 |
18 | 201017268344078 |
19 | 3668565147279423 |
20 | 70619879085128903 |
21 | 1430052551473860292 |
[1,0,0,0,2,9,50,318,2310,19060,176310,1807181, 20330788,249052161,3299941145,47024161317, 717118460090,11653174976468,201017268344078, 3668565147279423,70619879085128903, 1430052551473860292] |