n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 6 |
4 | 19 |
5 | 57 |
6 | 258 |
7 | 1110 |
8 | 5475 |
9 | 27429 |
10 | 143379 |
11 | 764970 |
12 | 4173906 |
13 | 23140816 |
14 | 130205922 |
15 | 741650802 |
16 | 4270593219 |
17 | 24825326199 |
18 | 145535320383 |
19 | 859627488966 |
20 | 5112006997539 |
21 | 30586307211945 |
22 | 184023410798910 |
23 | 1112800162657902 |
24 | 6760426635625170 |
[1,1,3,6,19,57,258,1110,5475,27429,143379,764970, 4173906,23140816,130205922,741650802,4270593219, 24825326199,145535320383,859627488966, 5112006997539,30586307211945,184023410798910, 1112800162657902,6760426635625170] |