n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 8 |
4 | 41 |
5 | 205 |
6 | 989 |
7 | 4785 |
8 | 23881 |
9 | 124245 |
10 | 673020 |
11 | 3771678 |
12 | 21702164 |
13 | 127311556 |
14 | 756930002 |
15 | 4539680854 |
16 | 27367146987 |
17 | 165407567379 |
18 | 1000581963363 |
19 | 6051411131431 |
20 | 36569087782730 |
21 | 220760294880122 |
22 | 1331294835476618 |
23 | 8021165000866546 |
24 | 48296514171243436 |
25 | 290695754850732916 |
[1,1,2,8,41,205,989,4785,23881,124245,673020, 3771678,21702164,127311556,756930002,4539680854, 27367146987,165407567379,1000581963363, 6051411131431,36569087782730,220760294880122, 1331294835476618,8021165000866546, 48296514171243436,290695754850732916] |