n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 22 |
4 | 113 |
5 | 571 |
6 | 2816 |
7 | 13616 |
8 | 64678 |
9 | 302574 |
10 | 1397318 |
11 | 6382660 |
12 | 28882214 |
13 | 129640058 |
14 | 577812724 |
15 | 2559491834 |
16 | 11276000877 |
17 | 49437494408 |
18 | 215815377168 |
[1,4,22,113,571,2816,13616,64678,302574,1397318, 6382660,28882214,129640058,577812724,2559491834, 11276000877,49437494408,215815377168] |