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A009082 as a simple table

na(n)
01
1-1
25
3-157
43817
5-257049
615886125
7-1844058101
8218349214545
9-38729647296945
107468216325125589
11-1882371895493492429
12533348579359954590009
13-181834605583994802568393

[1,-1,5,-157,3817,-257049,15886125,-1844058101,
 218349214545,-38729647296945,7468216325125589,
 -1882371895493492429,533348579359954590009,
 -181834605583994802568393]