n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 3 |
5 | 9 |
6 | 27 |
7 | 76 |
8 | 211 |
9 | 580 |
10 | 1578 |
11 | 4267 |
12 | 11484 |
13 | 30789 |
14 | 82301 |
15 | 219465 |
16 | 584060 |
17 | 1551770 |
18 | 4117061 |
19 | 10910049 |
20 | 28881387 |
21 | 76387179 |
22 | 201875129 |
23 | 533145603 |
24 | 1407161007 |
25 | 3711981168 |
26 | 9787157469 |
27 | 25793933410 |
28 | 67952779665 |
29 | 178954077522 |
[0,0,0,1,3,9,27,76,211,580,1578,4267,11484,30789, 82301,219465,584060,1551770,4117061,10910049, 28881387,76387179,201875129,533145603,1407161007, 3711981168,9787157469,25793933410,67952779665, 178954077522] |