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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | -3 |
| 5 | 15 |
| 6 | 25 |
| 7 | 21 |
| 8 | -45 |
| 9 | 150 |
| 10 | 125 |
| 11 | -231 |
| 12 | 375 |
| 13 | -375 |
| 14 | 1250 |
| 15 | 625 |
| 16 | 693 |
| 17 | -981 |
| 18 | 750 |
| 19 | -375 |
| 20 | 1875 |
| 21 | 625 |
| 22 | -13167 |
| 23 | 17199 |
| 24 | -11655 |
| 25 | 5250 |
| 26 | 13125 |
| 27 | 3125 |
| 28 | 302841 |
| 29 | -375417 |
| 30 | 237510 |
| 31 | -100275 |
| 32 | 26250 |
| 33 | 26250 |
| 34 | 87500 |
| 35 | 15625 |
| 36 | 8176707 |
| 37 | -9773379 |
| 38 | 5914755 |
| 39 | -2390850 |
| 40 | 685125 |
| 41 | -78750 |
[1,1,5,-3,15,25,21,-45,150,125,-231,375,-375,1250, 625,693,-981,750,-375,1875,625,-13167,17199, -11655,5250,13125,3125,302841,-375417,237510, -100275,26250,26250,87500,15625,8176707,-9773379, 5914755,-2390850,685125,-78750] |