n | a(n) |
---|---|
1 | 1 |
2 | 0 |
3 | 1 |
4 | 2 |
5 | 4 |
6 | 11 |
7 | 28 |
8 | 75 |
9 | 207 |
10 | 579 |
11 | 1647 |
12 | 4744 |
13 | 13807 |
14 | 40550 |
15 | 120016 |
16 | 357613 |
17 | 1071916 |
18 | 3229870 |
19 | 9777767 |
20 | 29724593 |
21 | 90705886 |
22 | 277744244 |
23 | 853123473 |
24 | 2627968236 |
25 | 8116487286 |
26 | 25128482223 |
27 | 77971354506 |
28 | 242439732171 |
[1,0,1,2,4,11,28,75,207,579,1647,4744,13807,40550, 120016,357613,1071916,3229870,9777767,29724593, 90705886,277744244,853123473,2627968236, 8116487286,25128482223,77971354506,242439732171] |