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A118184 as a simple table

na(n)
00
11
2-1
33
4-23
5329
618231
7-22030373
834718491601
9-130548608723439
101300095260497408879
11-35497483240662990289357
122687397326811421691366217657
13-562747611676887059779727492799911
14320110532506391993959111359699070808231

[0,1,-1,3,-23,329,18231,-22030373,34718491601,
 -130548608723439,1300095260497408879,
 -35497483240662990289357,
 2687397326811421691366217657,
 -562747611676887059779727492799911,
 320110532506391993959111359699070808231]