n | a(n) |
---|---|
1 | -1 |
2 | -1 |
3 | 1 |
4 | 11 |
5 | 49 |
6 | 179 |
7 | 601 |
8 | 1931 |
9 | 6049 |
10 | 18659 |
11 | 57001 |
12 | 173051 |
13 | 523249 |
14 | 1577939 |
15 | 4750201 |
16 | 14283371 |
17 | 42915649 |
18 | 128878019 |
19 | 386896201 |
20 | 1161212891 |
21 | 3484687249 |
22 | 10456158899 |
23 | 31372671001 |
24 | 94126401611 |
25 | 282395982049 |
26 | 847221500579 |
27 | 2541731610601 |
28 | 7625329049531 |
29 | 22876255584049 |
[-1,-1,1,11,49,179,601,1931,6049,18659,57001, 173051,523249,1577939,4750201,14283371,42915649, 128878019,386896201,1161212891,3484687249, 10456158899,31372671001,94126401611,282395982049, 847221500579,2541731610601,7625329049531, 22876255584049] |