The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | -1 |
| 4 | 1 |
| 5 | -2 |
| 6 | -2 |
| 7 | 1 |
| 8 | -3 |
| 9 | -3 |
| 10 | 5 |
| 11 | 1 |
| 12 | -4 |
| 13 | -4 |
| 14 | 16 |
| 15 | 16 |
| 16 | 1 |
| 17 | -5 |
| 18 | -5 |
| 19 | 35 |
| 20 | 35 |
| 21 | -61 |
| 22 | 1 |
| 23 | -6 |
| 24 | -6 |
| 25 | 64 |
| 26 | 64 |
| 27 | -272 |
| 28 | -272 |
| 29 | 1 |
| 30 | -7 |
| 31 | -7 |
| 32 | 105 |
| 33 | 105 |
| 34 | -791 |
| 35 | -791 |
| 36 | 1385 |
| 37 | 1 |
| 38 | -8 |
| 39 | -8 |
| 40 | 160 |
| 41 | 160 |
| 42 | -1856 |
| 43 | -1856 |
| 44 | 7936 |
| 45 | 7936 |
| 46 | 1 |
| 47 | -9 |
| 48 | -9 |
| 49 | 231 |
| 50 | 231 |
| 51 | -3801 |
| 52 | -3801 |
| 53 | 28839 |
| 54 | 28839 |
| 55 | -50521 |
[1,1,1,-1,1,-2,-2,1,-3,-3,5,1,-4,-4,16,16,1,-5,-5, 35,35,-61,1,-6,-6,64,64,-272,-272,1,-7,-7,105,105, -791,-791,1385,1,-8,-8,160,160,-1856,-1856,7936, 7936,1,-9,-9,231,231,-3801,-3801,28839,28839, -50521] |