n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | -4 |
3 | -10 |
4 | 30 |
5 | 72 |
6 | -238 |
7 | -580 |
8 | 1970 |
9 | 4910 |
10 | -16734 |
11 | -42750 |
12 | 144600 |
13 | 379000 |
14 | -1264700 |
15 | -3402480 |
16 | 11160730 |
17 | 30828070 |
18 | -99168820 |
19 | -281279030 |
20 | 885931600 |
21 | 2580541580 |
22 | -7948885910 |
23 | -23779051760 |
24 | 71572652480 |
25 | 219906488302 |
26 | -646332447086 |
27 | -2039738985238 |
28 | 5850898295170 |
[1,2,-4,-10,30,72,-238,-580,1970,4910,-16734, -42750,144600,379000,-1264700,-3402480,11160730, 30828070,-99168820,-281279030,885931600, 2580541580,-7948885910,-23779051760,71572652480, 219906488302,-646332447086,-2039738985238, 5850898295170] |