n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 1 |
4 | 4 |
5 | 6 |
6 | 28 |
7 | 83 |
8 | 289 |
9 | 1030 |
10 | 3860 |
11 | 14154 |
12 | 53222 |
13 | 202001 |
14 | 771255 |
15 | 2945803 |
16 | 11304541 |
17 | 43564276 |
18 | 168413249 |
19 | 652292925 |
20 | 2531493604 |
21 | 9845752518 |
22 | 38372748112 |
[0,1,1,4,6,28,83,289,1030,3860,14154,53222,202001, 771255,2945803,11304541,43564276,168413249, 652292925,2531493604,9845752518,38372748112] |