n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 2 |
3 | 6 |
4 | 16 |
5 | 40 |
6 | 98 |
7 | 238 |
8 | 576 |
9 | 1392 |
10 | 3362 |
11 | 8118 |
12 | 19600 |
13 | 47320 |
14 | 114242 |
15 | 275806 |
16 | 665856 |
17 | 1607520 |
18 | 3880898 |
19 | 9369318 |
20 | 22619536 |
21 | 54608392 |
22 | 131836322 |
23 | 318281038 |
24 | 768398400 |
25 | 1855077840 |
26 | 4478554082 |
27 | 10812186006 |
28 | 26102926096 |
29 | 63018038200 |
30 | 152139002498 |
[0,0,2,6,16,40,98,238,576,1392,3362,8118,19600, 47320,114242,275806,665856,1607520,3880898, 9369318,22619536,54608392,131836322,318281038, 768398400,1855077840,4478554082,10812186006, 26102926096,63018038200,152139002498] |