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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | -2 |
| 5 | 9 |
| 6 | -4 |
| 7 | 28 |
| 8 | 18 |
| 9 | 118 |
| 10 | 80 |
| 11 | 504 |
| 12 | 466 |
| 13 | 1631 |
| 14 | 2160 |
| 15 | 5466 |
| 16 | 7498 |
| 17 | 17658 |
| 18 | 25088 |
| 19 | 51944 |
| 20 | 78660 |
| 21 | 149099 |
| 22 | 226544 |
| 23 | 412920 |
| 24 | 627830 |
| 25 | 1090006 |
| 26 | 1671840 |
| 27 | 2796805 |
| 28 | 4263984 |
| 29 | 6969690 |
| 30 | 10555224 |
| 31 | 16836620 |
| 32 | 25396506 |
| 33 | 39699240 |
| 34 | 59409184 |
| 35 | 91460952 |
| 36 | 135795598 |
| 37 | 205951071 |
| 38 | 303740496 |
| 39 | 454672142 |
[1,-2,9,-4,28,18,118,80,504,466,1631,2160,5466, 7498,17658,25088,51944,78660,149099,226544,412920, 627830,1090006,1671840,2796805,4263984,6969690, 10555224,16836620,25396506,39699240,59409184, 91460952,135795598,205951071,303740496,454672142] |