n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 2 |
4 | 8 |
5 | 41 |
6 | 231 |
7 | 1527 |
8 | 11610 |
9 | 99850 |
10 | 958561 |
11 | 10160755 |
12 | 117864768 |
13 | 1485096081 |
14 | 20197306708 |
15 | 294880677941 |
16 | 4600138575887 |
17 | 76362300359740 |
18 | 1343976486331425 |
19 | 24997962645764522 |
20 | 489960067856984638 |
[1,0,0,2,8,41,231,1527,11610,99850,958561, 10160755,117864768,1485096081,20197306708, 294880677941,4600138575887,76362300359740, 1343976486331425,24997962645764522, 489960067856984638] |