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A292706 as a simple table

na(n)
10
21
3-31
42060
5-242972
644808921
7-11905513623
84306834677808
9-2035350070549744
101217544864812657225
11-899267301542329562375
12803729476432302540694956
13-854933675015747706872042556
141067328531318200947345698975505
15-1545426104859564195269842899644047

[0,1,-31,2060,-242972,44808921,-11905513623,
 4306834677808,-2035350070549744,
 1217544864812657225,-899267301542329562375,
 803729476432302540694956,
 -854933675015747706872042556,
 1067328531318200947345698975505,
 -1545426104859564195269842899644047]