n | a(n) |
---|---|
0 | -1 |
1 | -1 |
2 | 3 |
3 | 29 |
4 | 159 |
5 | 749 |
6 | 3303 |
7 | 14069 |
8 | 58719 |
9 | 241949 |
10 | 988503 |
11 | 4015109 |
12 | 16241679 |
13 | 65506349 |
14 | 263636103 |
15 | 1059360149 |
16 | 4251855039 |
17 | 17050597949 |
18 | 68331794103 |
19 | 273715121189 |
20 | 1096023794799 |
21 | 4387584060749 |
22 | 17560800790503 |
23 | 70274592610229 |
24 | 281192530396959 |
25 | 1125052584678749 |
[-1,-1,3,29,159,749,3303,14069,58719,241949, 988503,4015109,16241679,65506349,263636103, 1059360149,4251855039,17050597949,68331794103, 273715121189,1096023794799,4387584060749, 17560800790503,70274592610229,281192530396959, 1125052584678749] |