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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | -1 |
| 4 | 7 |
| 5 | -9 |
| 6 | 23 |
| 7 | -41 |
| 8 | 87 |
| 9 | -169 |
| 10 | 343 |
| 11 | -681 |
| 12 | 1367 |
| 13 | -2729 |
| 14 | 5463 |
| 15 | -10921 |
| 16 | 21847 |
| 17 | -43689 |
| 18 | 87383 |
| 19 | -174761 |
| 20 | 349527 |
| 21 | -699049 |
| 22 | 1398103 |
| 23 | -2796201 |
| 24 | 5592407 |
| 25 | -11184809 |
| 26 | 22369623 |
| 27 | -44739241 |
| 28 | 89478487 |
| 29 | -178956969 |
| 30 | 357913943 |
| 31 | -715827881 |
[0,1,3,-1,7,-9,23,-41,87,-169,343,-681,1367,-2729, 5463,-10921,21847,-43689,87383,-174761,349527, -699049,1398103,-2796201,5592407,-11184809, 22369623,-44739241,89478487,-178956969,357913943, -715827881] |