n | a(n) |
---|---|
1 | 0 |
2 | 2 |
3 | 9 |
4 | 32 |
5 | 105 |
6 | 332 |
7 | 1029 |
8 | 3152 |
9 | 9585 |
10 | 29012 |
11 | 87549 |
12 | 263672 |
13 | 793065 |
14 | 2383292 |
15 | 7158069 |
16 | 21490592 |
17 | 64504545 |
18 | 193579172 |
19 | 580868589 |
20 | 1742867912 |
21 | 5229128025 |
22 | 15688432652 |
23 | 47067395109 |
24 | 141206379632 |
25 | 423627527505 |
26 | 1270899359732 |
27 | 3812731633629 |
28 | 11438262009752 |
[0,2,9,32,105,332,1029,3152,9585,29012,87549, 263672,793065,2383292,7158069,21490592,64504545, 193579172,580868589,1742867912,5229128025, 15688432652,47067395109,141206379632,423627527505, 1270899359732,3812731633629,11438262009752] |