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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 18 |
| 3 | 1170 |
| 4 | -1890 |
| 5 | 133326 |
| 6 | 101250 |
| 7 | 20498994 |
| 8 | -164656314 |
| 9 | 3778220862 |
| 10 | -28085954094 |
| 11 | 771567716970 |
| 12 | -10691904063114 |
| 13 | 183594050113518 |
| 14 | -2711145260068326 |
| 15 | 49416883617381354 |
| 16 | -789899109743435994 |
| 17 | 13176840267952166070 |
| 18 | -216403389726994588086 |
| 19 | 3681309971143060236810 |
[1,6,18,1170,-1890,133326,101250,20498994, -164656314,3778220862,-28085954094,771567716970, -10691904063114,183594050113518,-2711145260068326, 49416883617381354,-789899109743435994, 13176840267952166070,-216403389726994588086, 3681309971143060236810] |