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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -18 |
| 2 | 117 |
| 3 | -222 |
| 4 | -936 |
| 5 | 4680 |
| 6 | -951 |
| 7 | -23634 |
| 8 | 4815 |
| 9 | 89692 |
| 10 | 170019 |
| 11 | -583992 |
| 12 | -1009011 |
| 13 | 1753434 |
| 14 | 3755619 |
| 15 | 3911748 |
| 16 | -16001739 |
| 17 | -35135352 |
| 18 | 6931209 |
| 19 | 99524520 |
| 20 | 287076168 |
| 21 | -92384118 |
| 22 | -969330771 |
| 23 | -1271547612 |
| 24 | -41096046 |
[1,-18,117,-222,-936,4680,-951,-23634,4815,89692, 170019,-583992,-1009011,1753434,3755619,3911748, -16001739,-35135352,6931209,99524520,287076168, -92384118,-969330771,-1271547612,-41096046] |