n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 0 |
7 | 4 |
8 | 10 |
9 | 34 |
10 | 96 |
11 | 284 |
12 | 782 |
13 | 2226 |
14 | 6208 |
15 | 17560 |
16 | 49618 |
17 | 141500 |
18 | 405104 |
19 | 1168316 |
20 | 3386538 |
21 | 9875232 |
22 | 28939944 |
23 | 85235762 |
24 | 252159572 |
25 | 749160544 |
26 | 2234378156 |
27 | 6688358338 |
28 | 20088296030 |
29 | 60524845158 |
30 | 182893018756 |
[0,0,0,0,0,0,4,10,34,96,284,782,2226,6208,17560, 49618,141500,405104,1168316,3386538,9875232, 28939944,85235762,252159572,749160544,2234378156, 6688358338,20088296030,60524845158,182893018756] |