n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 3 |
4 | 11 |
5 | 33 |
6 | 105 |
7 | 315 |
8 | 961 |
9 | 2883 |
10 | 8697 |
11 | 26091 |
12 | 78411 |
13 | 235233 |
14 | 706113 |
15 | 2118339 |
16 | 6356243 |
17 | 19068729 |
18 | 57209865 |
19 | 171629595 |
20 | 514899771 |
21 | 1544699313 |
22 | 4634130897 |
23 | 13902392691 |
24 | 41707276809 |
25 | 125121830427 |
26 | 375365787489 |
27 | 1126097362467 |
[0,0,1,3,11,33,105,315,961,2883,8697,26091,78411, 235233,706113,2118339,6356243,19068729,57209865, 171629595,514899771,1544699313,4634130897, 13902392691,41707276809,125121830427,375365787489, 1126097362467] |