n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 10 |
5 | 36 |
6 | 120 |
7 | 368 |
8 | 1089 |
9 | 3304 |
10 | 10168 |
11 | 31312 |
12 | 95880 |
13 | 293120 |
14 | 896824 |
15 | 2746569 |
16 | 8411818 |
17 | 25756220 |
18 | 78853410 |
19 | 241421436 |
20 | 739183568 |
21 | 2263249600 |
22 | 6929580817 |
23 | 21216729488 |
24 | 64960656448 |
25 | 198894856144 |
26 | 608971496032 |
27 | 1864533223584 |
28 | 5708777321872 |
[0,1,2,4,10,36,120,368,1089,3304,10168,31312, 95880,293120,896824,2746569,8411818,25756220, 78853410,241421436,739183568,2263249600, 6929580817,21216729488,64960656448,198894856144, 608971496032,1864533223584,5708777321872] |