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A009484 as a simple table

na(n)
00
12
2-4
3-114
43352
5-35270
6-2244012
7198654470
8-8021832016
9-150983244558
1067525484385580
11-7526828271926018
12368068475511786696
1348206694242241834026
14-16586068178557581107068
152563355081796258270543990
16-153878422314204916436611232

[0,2,-4,-114,3352,-35270,-2244012,198654470,
 -8021832016,-150983244558,67525484385580,
 -7526828271926018,368068475511786696,
 48206694242241834026,-16586068178557581107068,
 2563355081796258270543990,
 -153878422314204916436611232]