n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 1 |
3 | -1 |
4 | -3 |
5 | -1 |
6 | -7 |
7 | -1 |
8 | -43 |
9 | -1 |
10 | -1807 |
11 | -1 |
12 | -3263443 |
13 | -1 |
14 | -10650056950807 |
15 | -1 |
16 | -113423713055421844361000443 |
17 | -1 |
18 | -12864938683278671740537145998360961546653259485195807 |
19 | -1 |
[1,2,1,-1,-3,-1,-7,-1,-43,-1,-1807,-1,-3263443,-1, -10650056950807,-1,-113423713055421844361000443, -1, -1286493868327867174053714599836096154665325948519\ 5807,-1] |