n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 14 |
6 | 38 |
7 | 216 |
8 | 600 |
9 | 6240 |
10 | 9552 |
11 | 319296 |
12 | -519312 |
13 | 28108560 |
14 | -176474352 |
15 | 3998454144 |
16 | -43985078784 |
17 | 837126163584 |
18 | -12437000028288 |
19 | 237195036797184 |
20 | -4235955315745536 |
21 | 85886259443020800 |
22 | -1746536474655406080 |
23 | 38320721602434017280 |
24 | -864056965711935974400 |
[1,1,1,2,4,14,38,216,600,6240,9552,319296,-519312, 28108560,-176474352,3998454144,-43985078784, 837126163584,-12437000028288,237195036797184, -4235955315745536,85886259443020800, -1746536474655406080,38320721602434017280, -864056965711935974400] |