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A352415 as a simple table

na(n)
01
14
2-15
395
4-815
57881
6-81946
7894100
8-10097235
9117019845
10-1383816039
1116631112009
12-202545350505
132494192904025
14-31003553499195
15388498706407341
16-4902323847971661
1762240419152427905
18-794494411812382465
1910190561785036460125

[1,4,-15,95,-815,7881,-81946,894100,-10097235,
 117019845,-1383816039,16631112009,-202545350505,
 2494192904025,-31003553499195,388498706407341,
 -4902323847971661,62240419152427905,
 -794494411812382465,10190561785036460125]