n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 3 |
4 | 9 |
5 | 28 |
6 | 88 |
7 | 278 |
8 | 873 |
9 | 2743 |
10 | 8616 |
11 | 27067 |
12 | 85033 |
13 | 267138 |
14 | 839238 |
15 | 2636541 |
16 | 8282935 |
17 | 26021607 |
18 | 81749288 |
19 | 256822959 |
20 | 806833118 |
21 | 2534740993 |
22 | 7963123681 |
23 | 25016890852 |
24 | 78592880514 |
25 | 246906816045 |
26 | 775680639403 |
27 | 2436872598277 |
28 | 7655661052477 |
29 | 24050968520831 |
[0,0,1,3,9,28,88,278,873,2743,8616,27067,85033, 267138,839238,2636541,8282935,26021607,81749288, 256822959,806833118,2534740993,7963123681, 25016890852,78592880514,246906816045,775680639403, 2436872598277,7655661052477,24050968520831] |