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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -2 |
| 2 | 6 |
| 3 | -15 |
| 4 | 33 |
| 5 | -68 |
| 6 | 134 |
| 7 | -253 |
| 8 | 460 |
| 9 | -811 |
| 10 | 1394 |
| 11 | -2344 |
| 12 | 3863 |
| 13 | -6253 |
| 14 | 9964 |
| 15 | -15653 |
| 16 | 24269 |
| 17 | -37178 |
| 18 | 56331 |
| 19 | -84489 |
| 20 | 125529 |
| 21 | -184867 |
| 22 | 270027 |
| 23 | -391391 |
| 24 | 563205 |
| 25 | -804925 |
| 26 | 1142998 |
| 27 | -1613195 |
| 28 | 2263675 |
| 29 | -3159023 |
| 30 | 4385502 |
| 31 | -6057865 |
| 32 | 8328200 |
| 33 | -11397371 |
| 34 | 15529768 |
[1,-2,6,-15,33,-68,134,-253,460,-811,1394,-2344, 3863,-6253,9964,-15653,24269,-37178,56331,-84489, 125529,-184867,270027,-391391,563205,-804925, 1142998,-1613195,2263675,-3159023,4385502, -6057865,8328200,-11397371,15529768] |