n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 9 |
5 | 41 |
6 | 231 |
7 | 1528 |
8 | 11610 |
9 | 99850 |
10 | 958562 |
11 | 10160756 |
12 | 117864768 |
13 | 1485096081 |
14 | 20197306708 |
15 | 294880677942 |
16 | 4600138575888 |
17 | 76362300359740 |
18 | 1343976486331426 |
19 | 24997962645764522 |
20 | 489960067856984638 |
[1,1,1,2,9,41,231,1528,11610,99850,958562, 10160756,117864768,1485096081,20197306708, 294880677942,4600138575888,76362300359740, 1343976486331426,24997962645764522, 489960067856984638] |