n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 10 |
3 | -24 |
4 | -420 |
5 | -960 |
6 | 22680 |
7 | 201600 |
8 | -1496880 |
9 | -36288000 |
10 | 64864800 |
11 | 7823692800 |
12 | 25297272000 |
13 | -2092278988800 |
14 | -18988521552000 |
15 | 690452066304000 |
16 | 11457025515936000 |
17 | -277436193914880000 |
18 | -7430805000755136000 |
19 | 133809610449715200000 |
20 | 5500591866494524800000 |
21 | -76432049488877322240000 |
[1,4,10,-24,-420,-960,22680,201600,-1496880, -36288000,64864800,7823692800,25297272000, -2092278988800,-18988521552000,690452066304000, 11457025515936000,-277436193914880000, -7430805000755136000,133809610449715200000, 5500591866494524800000,-76432049488877322240000] |