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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | -9 |
| 3 | 30 |
| 4 | -15 |
| 5 | -240 |
| 6 | 978 |
| 7 | -1463 |
| 8 | -2361 |
| 9 | 18201 |
| 10 | -42800 |
| 11 | 15624 |
| 12 | 227742 |
| 13 | -809028 |
| 14 | 1088367 |
| 15 | 1593120 |
| 16 | -11383551 |
| 17 | 25003158 |
| 18 | -8589729 |
| 19 | -119069358 |
| 20 | 403991280 |
| 21 | -521730930 |
| 22 | -736063496 |
| 23 | 5088063696 |
| 24 | -10843708302 |
| 25 | 3624181875 |
| 26 | 48991048836 |
| 27 | -162420646812 |
| 28 | 205328313785 |
| 29 | 284014016994 |
[1,-9,30,-15,-240,978,-1463,-2361,18201,-42800, 15624,227742,-809028,1088367,1593120,-11383551, 25003158,-8589729,-119069358,403991280,-521730930, -736063496,5088063696,-10843708302,3624181875, 48991048836,-162420646812,205328313785, 284014016994] |