n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 4 |
3 | -30 |
4 | -216 |
5 | 420 |
6 | 14400 |
7 | 22680 |
8 | -1411200 |
9 | -8482320 |
10 | 195955200 |
11 | 2399997600 |
12 | -36883123200 |
13 | -788107320000 |
14 | 9066542284800 |
15 | 318173519664000 |
16 | -2824576634880000 |
17 | -159078423407904000 |
18 | 1088403529973760000 |
19 | 97970873094110016000 |
20 | -508476519708917760000 |
21 | -73631427647097640320000 |
[1,3,4,-30,-216,420,14400,22680,-1411200,-8482320, 195955200,2399997600,-36883123200,-788107320000, 9066542284800,318173519664000,-2824576634880000, -159078423407904000,1088403529973760000, 97970873094110016000,-508476519708917760000, -73631427647097640320000] |