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A025166 as a simple table

n a(n)
0 -1
1 -1
2 -1
3 7
4 127
5 1711
6 23231
7 334391
8 5144063
9 84149983
10 1446872959
11 25661798119
12 454494403199
13 7489030040207
14 89680375568447
15 -759618144120809
16 -127049044802971649
17 -7480338932613448769
18 -369274690558092738817
19 -17262533154073740329017

[-1,-1,-1,7,127,1711,23231,334391,5144063,
 84149983,1446872959,25661798119,454494403199,
 7489030040207,89680375568447,-759618144120809,
 -127049044802971649,-7480338932613448769,
 -369274690558092738817,-17262533154073740329017]

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Last modified April 25 10:22 EDT 2024. Contains 371967 sequences. (Running on oeis4.)