n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 1 |
3 | 4 |
4 | 9 |
5 | 31 |
6 | 91 |
7 | 309 |
8 | 1009 |
9 | 3481 |
10 | 11956 |
11 | 42065 |
12 | 148655 |
13 | 532039 |
14 | 1915369 |
15 | 6950452 |
16 | 25357233 |
17 | 93034813 |
18 | 342888250 |
19 | 1269246437 |
20 | 4715945712 |
21 | 17583623988 |
22 | 65766726906 |
23 | 246694006971 |
24 | 927801717255 |
25 | 3497918129001 |
26 | 13217196871126 |
27 | 50046561077947 |
[0,1,1,4,9,31,91,309,1009,3481,11956,42065,148655, 532039,1915369,6950452,25357233,93034813, 342888250,1269246437,4715945712,17583623988, 65766726906,246694006971,927801717255, 3497918129001,13217196871126,50046561077947] |