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A012626 as a simple table

na(n)
00
12
2-12
3-2
410248
5-672678
6-20843460
716777261590
8-2958597356400
9-195442688499150
10352062527506877700
11-110808084056350289490
12-28855116263423436192360
1355915766816627672060266890

[0,2,-12,-2,10248,-672678,-20843460,16777261590,
 -2958597356400,-195442688499150,
 352062527506877700,-110808084056350289490,
 -28855116263423436192360,
 55915766816627672060266890]