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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | -1 |
| 4 | 1 |
| 5 | -3 |
| 6 | 1 |
| 7 | -6 |
| 8 | 5 |
| 9 | 1 |
| 10 | -10 |
| 11 | 25 |
| 12 | 1 |
| 13 | -15 |
| 14 | 75 |
| 15 | -61 |
| 16 | 1 |
| 17 | -21 |
| 18 | 175 |
| 19 | -427 |
| 20 | 1 |
| 21 | -28 |
| 22 | 350 |
| 23 | -1708 |
| 24 | 1385 |
| 25 | 1 |
| 26 | -36 |
| 27 | 630 |
| 28 | -5124 |
| 29 | 12465 |
| 30 | 1 |
| 31 | -45 |
| 32 | 1050 |
| 33 | -12810 |
| 34 | 62325 |
| 35 | -50521 |
| 36 | 1 |
| 37 | -55 |
| 38 | 1650 |
| 39 | -28182 |
| 40 | 228525 |
| 41 | -555731 |
| 42 | 1 |
| 43 | -66 |
| 44 | 2475 |
| 45 | -56364 |
| 46 | 685575 |
| 47 | -3334386 |
| 48 | 2702765 |
| 49 | 1 |
[1,1,1,-1,1,-3,1,-6,5,1,-10,25,1,-15,75,-61,1,-21, 175,-427,1,-28,350,-1708,1385,1,-36,630,-5124, 12465,1,-45,1050,-12810,62325,-50521,1,-55,1650, -28182,228525,-555731,1,-66,2475,-56364,685575, -3334386,2702765,1] |