n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 4 |
5 | 12 |
6 | 33 |
7 | 88 |
8 | 232 |
9 | 609 |
10 | 1596 |
11 | 4180 |
12 | 10945 |
13 | 28656 |
14 | 75024 |
15 | 196417 |
16 | 514228 |
17 | 1346268 |
18 | 3524577 |
19 | 9227464 |
20 | 24157816 |
21 | 63245985 |
22 | 165580140 |
23 | 433494436 |
24 | 1134903169 |
25 | 2971215072 |
26 | 7778742048 |
27 | 20365011073 |
28 | 53316291172 |
29 | 139583862444 |
30 | 365435296161 |
31 | 956722026040 |
[0,0,0,1,4,12,33,88,232,609,1596,4180,10945,28656, 75024,196417,514228,1346268,3524577,9227464, 24157816,63245985,165580140,433494436,1134903169, 2971215072,7778742048,20365011073,53316291172, 139583862444,365435296161,956722026040] |