The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 0 |
| 3 | 1 |
| 4 | -1 |
| 5 | 0 |
| 6 | 1 |
| 7 | -1 |
| 8 | 0 |
| 9 | 0 |
| 10 | 1 |
| 11 | -1 |
| 12 | -1 |
| 13 | -6 |
| 14 | 0 |
| 15 | 1 |
| 16 | -1 |
| 17 | -1 |
| 18 | 0 |
| 19 | 24 |
| 20 | 0 |
| 21 | 1 |
| 22 | -1 |
| 23 | -1 |
| 24 | -1 |
| 25 | -6 |
| 26 | -120 |
| 27 | 0 |
| 28 | 1 |
| 29 | -1 |
| 30 | -1 |
| 31 | -1 |
| 32 | 2 |
| 33 | 30 |
| 34 | 720 |
| 35 | 0 |
| 36 | 1 |
| 37 | -1 |
| 38 | -1 |
| 39 | -1 |
| 40 | 1 |
| 41 | 10 |
| 42 | 270 |
| 43 | -5040 |
| 44 | 0 |
| 45 | 1 |
| 46 | -1 |
| 47 | -1 |
| 48 | -1 |
| 49 | 1 |
| 50 | 20 |
| 51 | 170 |
| 52 | 0 |
| 53 | 80640 |
| 54 | 0 |
| 55 | 1 |
| 56 | -1 |
| 57 | -1 |
| 58 | -1 |
| 59 | 1 |
| 60 | 19 |
| 61 | 140 |
| 62 | 1050 |
| 63 | 2520 |
| 64 | -725760 |
| 65 | 0 |
| 66 | 1 |
| 67 | -1 |
[1,1,0,1,-1,0,1,-1,0,0,1,-1,-1,-6,0,1,-1,-1,0,24, 0,1,-1,-1,-1,-6,-120,0,1,-1,-1,-1,2,30,720,0,1,-1, -1,-1,1,10,270,-5040,0,1,-1,-1,-1,1,20,170,0, 80640,0,1,-1,-1,-1,1,19,140,1050,2520,-725760,0,1, -1] |