n | a(n) |
---|---|
2 | 1 |
3 | 0 |
4 | 1 |
5 | 1 |
6 | 4 |
7 | 8 |
8 | 25 |
9 | 64 |
10 | 191 |
11 | 540 |
12 | 1616 |
13 | 4785 |
14 | 14512 |
15 | 44084 |
16 | 135545 |
17 | 418609 |
18 | 1302340 |
19 | 4070124 |
20 | 12785859 |
21 | 40325828 |
22 | 127689288 |
23 | 405689020 |
24 | 1293060464 |
25 | 4133173256 |
26 | 13246527139 |
27 | 42557271268 |
28 | 137032656700 |
29 | 442158893833 |
30 | 1429468244788 |
[1,0,1,1,4,8,25,64,191,540,1616,4785,14512,44084, 135545,418609,1302340,4070124,12785859,40325828, 127689288,405689020,1293060464,4133173256, 13246527139,42557271268,137032656700,442158893833, 1429468244788] |