n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 1 |
3 | 3 |
4 | 10 |
5 | 39 |
6 | 161 |
7 | 698 |
8 | 3126 |
9 | 14360 |
10 | 67276 |
11 | 320229 |
12 | 1544257 |
13 | 7528577 |
14 | 37044530 |
15 | 183733552 |
16 | 917598103 |
17 | 4610484729 |
18 | 23289784660 |
19 | 118209987295 |
20 | 602556082765 |
21 | 3083273829240 |
22 | 15832177371585 |
23 | 81554320766310 |
24 | 421320423560400 |
25 | 2182395044437686 |
26 | 11332298321692704 |
[0,1,1,3,10,39,161,698,3126,14360,67276,320229, 1544257,7528577,37044530,183733552,917598103, 4610484729,23289784660,118209987295,602556082765, 3083273829240,15832177371585,81554320766310, 421320423560400,2182395044437686, 11332298321692704] |