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A012230 as a simple table

na(n)
01
1-1
221
3-1101
4109001
5-17491001
64139085981
7-1355308485701
8586612833746961
9-324261948714025201
10222851423174495787941
11-186365710421614910029501
12186332939048243649892744921

[1,-1,21,-1101,109001,-17491001,4139085981,
 -1355308485701,586612833746961,
 -324261948714025201,222851423174495787941,
 -186365710421614910029501,
 186332939048243649892744921]