n | a(n) |
---|---|
3 | 0 |
4 | 0 |
5 | 4 |
6 | 6 |
7 | 4 |
8 | 16 |
9 | 60 |
10 | 88 |
11 | 228 |
12 | 646 |
13 | 1478 |
14 | 3378 |
15 | 9204 |
16 | 23076 |
17 | 56962 |
18 | 147596 |
19 | 386464 |
20 | 997460 |
21 | 2604046 |
22 | 6887292 |
23 | 18184174 |
24 | 48134500 |
25 | 128142898 |
26 | 341816941 |
27 | 912850576 |
28 | 2444465346 |
29 | 6558718548 |
30 | 17620876747 |
31 | 47420177380 |
[0,0,4,6,4,16,60,88,228,646,1478,3378,9204,23076, 56962,147596,386464,997460,2604046,6887292, 18184174,48134500,128142898,341816941,912850576, 2444465346,6558718548,17620876747,47420177380] |