n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | -1 |
3 | 1 |
4 | -8 |
5 | 45 |
6 | -301 |
7 | 2357 |
8 | -21608 |
9 | 223769 |
10 | -2602081 |
11 | 33484713 |
12 | -473210528 |
13 | 7282225093 |
14 | -121272163741 |
15 | 2172791685469 |
16 | -41680241726768 |
17 | 852337358029617 |
18 | -18510436676621281 |
19 | 425474580069715025 |
20 | -10319766893265298328 |
[0,1,-1,1,-8,45,-301,2357,-21608,223769,-2602081, 33484713,-473210528,7282225093,-121272163741, 2172791685469,-41680241726768,852337358029617, -18510436676621281,425474580069715025, -10319766893265298328] |