n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 1 |
4 | 2 |
5 | 4 |
6 | 9 |
7 | 24 |
8 | 73 |
9 | 241 |
10 | 881 |
11 | 3526 |
12 | 15252 |
13 | 70989 |
14 | 354454 |
15 | 1887349 |
16 | 10674773 |
17 | 63936181 |
18 | 404240736 |
19 | 2690174976 |
20 | 18798077227 |
21 | 137612318374 |
22 | 1053181689299 |
23 | 8410678868749 |
24 | 69966341141373 |
25 | 605313810207096 |
26 | 5438284743262816 |
27 | 50668461879077851 |
[1,1,1,1,2,4,9,24,73,241,881,3526,15252,70989, 354454,1887349,10674773,63936181,404240736, 2690174976,18798077227,137612318374,1053181689299, 8410678868749,69966341141373,605313810207096, 5438284743262816,50668461879077851] |