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A013126 as a simple table

na(n)
01
10
24
3-6
419
5-140
6814
7-5082
843509
9-400248
103812904
11-42180270
12520553895
13-6701464068
1492507196786
15-1398195467970
1622513722221865
17-380979724310896
186839735642061708
19-130277805146941014

[1,0,4,-6,19,-140,814,-5082,43509,-400248,3812904,
 -42180270,520553895,-6701464068,92507196786,
 -1398195467970,22513722221865,-380979724310896,
 6839735642061708,-130277805146941014]