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A228934 as a simple table

na(n)
12
24
315
4-99
5-199
6-800
7-79201
8-316808
9-12545596801
10-50182387208
11-314783998186522867201
12-1259135992746091468808
13-198177931028585663493396958369763763148801
14-792711724114342653973587833479055052595208

[2,4,15,-99,-199,-800,-79201,-316808,-12545596801,
 -50182387208,-314783998186522867201,
 -1259135992746091468808,
 -198177931028585663493396958369763763148801,
 -792711724114342653973587833479055052595208]