n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 12 |
4 | 52 |
5 | 240 |
6 | 1188 |
7 | 6804 |
8 | 38960 |
9 | 253296 |
10 | 1654560 |
11 | 11816640 |
12 | 85816608 |
13 | 668005728 |
14 | 5240582592 |
15 | 44667645120 |
16 | 365989405440 |
17 | 3494595006720 |
18 | 28075694694912 |
19 | 325862541872640 |
20 | 2101211758356480 |
21 | 39605981661066240 |
22 | 48568198208302080 |
23 | 7549838510211486720 |
24 | -66667098077331572736 |
[1,1,4,12,52,240,1188,6804,38960,253296,1654560, 11816640,85816608,668005728,5240582592, 44667645120,365989405440,3494595006720, 28075694694912,325862541872640,2101211758356480, 39605981661066240,48568198208302080, 7549838510211486720,-66667098077331572736] |