n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 4 |
4 | 11 |
5 | 41 |
6 | 162 |
7 | 714 |
8 | 3397 |
9 | 17251 |
10 | 92048 |
11 | 509444 |
12 | 2893683 |
13 | 16734381 |
14 | 97965934 |
15 | 578241694 |
16 | 3431848769 |
17 | 20442513431 |
18 | 122066210220 |
19 | 730058053464 |
20 | 4371040179055 |
21 | 26189154314401 |
22 | 156987015743306 |
23 | 941331763528754 |
[1,1,4,11,41,162,714,3397,17251,92048,509444, 2893683,16734381,97965934,578241694,3431848769, 20442513431,122066210220,730058053464, 4371040179055,26189154314401,156987015743306, 941331763528754] |