n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | -1 |
3 | 0 |
4 | 9 |
5 | -20 |
6 | 65 |
7 | 406 |
8 | -511 |
9 | 21624 |
10 | 88577 |
11 | 1053426 |
12 | 14764321 |
13 | 143838916 |
14 | 2193647521 |
15 | 29669704702 |
16 | 457719400449 |
17 | 7433158061552 |
18 | 128311987616769 |
19 | 2329120580336746 |
20 | 45112841958764321 |
21 | 905762343424701116 |
[1,1,-1,0,9,-20,65,406,-511,21624,88577,1053426, 14764321,143838916,2193647521,29669704702, 457719400449,7433158061552,128311987616769, 2329120580336746,45112841958764321, 905762343424701116] |