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A012642 as a simple table

na(n)
01
1-2
2-32
3152
448448
5289408
6-393649024
7-34249082624
812871254335488
92591959365570560
10-694262452828553216
11-534293242711984668672
1297599429997759939117056
13140451121892184627503628288

[1,-2,-32,152,48448,289408,-393649024,
 -34249082624,12871254335488,2591959365570560,
 -694262452828553216,-534293242711984668672,
 97599429997759939117056,
 140451121892184627503628288]