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A012673 as a simple table

na(n)
02
1-128
212032
3365688832
4-2002811158528
5-67148259011330048
63766780331499896963072
740680896591210190242578432
8-72225295511520670153244114157568

[2,-128,12032,365688832,-2002811158528,
 -67148259011330048,3766780331499896963072,
 40680896591210190242578432,
 -72225295511520670153244114157568]