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A012540 as a simple table

na(n)
02
18
2-160
3-11072
4-182912
550245120
67608017664
726249146368
8-262793796747264
9-58964881233854464
107005062900187299840
119928554014089367257088
122780197098515017535389696

[2,8,-160,-11072,-182912,50245120,7608017664,
 26249146368,-262793796747264,-58964881233854464,
 7005062900187299840,9928554014089367257088,
 2780197098515017535389696]