n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 1 |
5 | 4 |
6 | 24 |
7 | 96 |
8 | 412 |
9 | 1607 |
10 | 6348 |
11 | 24580 |
12 | 96334 |
13 | 378569 |
14 | 1508220 |
15 | 6079720 |
16 | 24879878 |
17 | 103335386 |
18 | 436032901 |
19 | 1869019800 |
20 | 8139613977 |
21 | 36008825317 |
22 | 161794412893 |
23 | 738167013847 |
24 | 3418757243139 |
25 | 16068569129711 |
26 | 76622168743677 |
27 | 370571105669576 |
28 | 1817199912384794 |
[1,0,0,0,1,4,24,96,412,1607,6348,24580,96334, 378569,1508220,6079720,24879878,103335386, 436032901,1869019800,8139613977,36008825317, 161794412893,738167013847,3418757243139, 16068569129711,76622168743677,370571105669576, 1817199912384794] |