n | a(n) |
---|---|
0 | 1 |
1 | 5 |
2 | -15 |
3 | 125 |
4 | -375 |
5 | 3125 |
6 | -9375 |
7 | 78125 |
8 | -234375 |
9 | 1953125 |
10 | -5859375 |
11 | 48828125 |
12 | -146484375 |
13 | 1220703125 |
14 | -3662109375 |
15 | 30517578125 |
16 | -91552734375 |
17 | 762939453125 |
18 | -2288818359375 |
19 | 19073486328125 |
20 | -57220458984375 |
21 | 476837158203125 |
22 | -1430511474609375 |
[1,5,-15,125,-375,3125,-9375,78125,-234375, 1953125,-5859375,48828125,-146484375,1220703125, -3662109375,30517578125,-91552734375,762939453125, -2288818359375,19073486328125,-57220458984375, 476837158203125,-1430511474609375] |