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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 15 |
| 4 | -6 |
| 5 | 40 |
| 6 | 12 |
| 7 | 77 |
| 8 | -60 |
| 9 | 180 |
| 10 | 30 |
| 11 | 187 |
| 12 | -120 |
| 13 | 260 |
| 14 | 56 |
| 15 | 630 |
| 16 | -376 |
| 17 | 442 |
| 18 | 117 |
| 19 | 551 |
| 20 | -340 |
| 21 | 1218 |
| 22 | 132 |
| 23 | 805 |
| 24 | -1104 |
| 25 | 1325 |
| 26 | 182 |
| 27 | 1998 |
| 28 | -672 |
| 29 | 1276 |
| 30 | 360 |
| 31 | 1457 |
| 32 | -2032 |
| 33 | 2970 |
| 34 | 306 |
| 35 | 3290 |
| 36 | -1710 |
| 37 | 2072 |
| 38 | 380 |
| 39 | 4134 |
| 40 | -3080 |
| 41 | 2542 |
| 42 | 672 |
| 43 | 2795 |
| 44 | -1672 |
| 45 | 7830 |
| 46 | 552 |
| 47 | 3337 |
| 48 | -6816 |
| 49 | 4998 |
| 50 | 775 |
| 51 | 7038 |
| 52 | -2340 |
| 53 | 4240 |
| 54 | 1080 |
[1,1,15,-6,40,12,77,-60,180,30,187,-120,260,56, 630,-376,442,117,551,-340,1218,132,805,-1104,1325, 182,1998,-672,1276,360,1457,-2032,2970,306,3290, -1710,2072,380,4134,-3080,2542,672,2795,-1672, 7830,552,3337,-6816,4998,775,7038,-2340,4240,1080] |