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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 5 |
| 2 | 7 |
| 3 | -26 |
| 4 | -265 |
| 5 | -1351 |
| 6 | -5042 |
| 7 | -13775 |
| 8 | -18817 |
| 9 | 70226 |
| 10 | 716035 |
| 11 | 3650401 |
| 12 | 13623482 |
| 13 | 37220045 |
| 14 | 50843527 |
| 15 | -189750626 |
| 16 | -1934726305 |
| 17 | -9863382151 |
| 18 | -36810643322 |
| 19 | -100568547815 |
| 20 | -137379191137 |
| 21 | 512706121226 |
| 22 | 5227629760075 |
| 23 | 26650854921601 |
[2,5,7,-26,-265,-1351,-5042,-13775,-18817,70226, 716035,3650401,13623482,37220045,50843527, -189750626,-1934726305,-9863382151,-36810643322, -100568547815,-137379191137,512706121226, 5227629760075,26650854921601] |