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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | -1 |
| 3 | 11 |
| 4 | -66 |
| 5 | 623 |
| 6 | -7743 |
| 7 | 117695 |
| 8 | -2097676 |
| 9 | 43046069 |
| 10 | -999989915 |
| 11 | 25937439347 |
| 12 | -743008621122 |
| 13 | 23298084749141 |
| 14 | -793714765727191 |
| 15 | 29192926036832303 |
| 16 | -1152921504875220776 |
| 17 | 48661191875256608663 |
| 18 | -2185911559727678466189 |
| 19 | 104127350297928222613599 |
[1,-1,11,-66,623,-7743,117695,-2097676,43046069, -999989915,25937439347,-743008621122, 23298084749141,-793714765727191,29192926036832303, -1152921504875220776,48661191875256608663, -2185911559727678466189,104127350297928222613599] |