n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 9 |
6 | 20 |
7 | 48 |
8 | 115 |
9 | 285 |
10 | 715 |
11 | 1826 |
12 | 4711 |
13 | 12303 |
14 | 32387 |
15 | 85964 |
16 | 229662 |
17 | 617300 |
18 | 1667787 |
19 | 4527290 |
20 | 12340688 |
21 | 33766612 |
22 | 92707834 |
23 | 255329106 |
[1,1,2,4,9,20,48,115,285,715,1826,4711,12303, 32387,85964,229662,617300,1667787,4527290, 12340688,33766612,92707834,255329106] |