n | a(n) |
---|---|
3 | 0 |
4 | 0 |
5 | 4 |
6 | 8 |
7 | 4 |
8 | 20 |
9 | 68 |
10 | 108 |
11 | 258 |
12 | 704 |
13 | 1586 |
14 | 3600 |
15 | 9474 |
16 | 23534 |
17 | 57098 |
18 | 146818 |
19 | 381946 |
20 | 979169 |
21 | 2546468 |
22 | 6725314 |
23 | 17734622 |
24 | 46896938 |
25 | 124860502 |
26 | 333177050 |
27 | 889946916 |
28 | 2383867805 |
29 | 6398917298 |
30 | 17196251103 |
31 | 46285522374 |
[0,0,4,8,4,20,68,108,258,704,1586,3600,9474,23534, 57098,146818,381946,979169,2546468,6725314, 17734622,46896938,124860502,333177050,889946916, 2383867805,6398917298,17196251103,46285522374] |