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A013703 as a simple table

na(n)
01
12
2-6
338
4-370
54874
6-81046
71628710
8-38393538
91038795658
10-31730277062
111080038539942
12-40538501660306
131663428036271754
14-74080097240364918
153558651343664651174
16-183423140013051563746
1710097324775041880827402
18-591270189493633774009510

[1,2,-6,38,-370,4874,-81046,1628710,-38393538,
 1038795658,-31730277062,1080038539942,
 -40538501660306,1663428036271754,
 -74080097240364918,3558651343664651174,
 -183423140013051563746,10097324775041880827402,
 -591270189493633774009510]