n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | -1 |
3 | -1 |
4 | 6 |
5 | -31 |
6 | 120 |
7 | -337 |
8 | -784 |
9 | 24705 |
10 | -288000 |
11 | 2451679 |
12 | -14032128 |
13 | -17936543 |
14 | 2173889536 |
15 | -42895630065 |
16 | 583266662400 |
17 | -5396647099903 |
18 | 5119183650816 |
19 | 1239561882325439 |
20 | -36754121131294720 |
21 | 708575518706816481 |
[0,1,-1,-1,6,-31,120,-337,-784,24705,-288000, 2451679,-14032128,-17936543,2173889536, -42895630065,583266662400,-5396647099903, 5119183650816,1239561882325439,-36754121131294720, 708575518706816481] |