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A015271 as a simple table

na(n)
31
4-51
53485
6-219555
714107485
8-901984419
957741320029
10-3695215419555
11236497451900765
12-15135778281070755
13968690748238618461
14-61996192875273494691
153967756584209486471005
16-253936417546335462858915

[1,-51,3485,-219555,14107485,-901984419,
 57741320029,-3695215419555,236497451900765,
 -15135778281070755,968690748238618461,
 -61996192875273494691,3967756584209486471005,
 -253936417546335462858915]