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A012687 as a simple table

na(n)
01
10
2-12
3480
4-18480
5176640
6149396544
7-38742692352
86743113079040
9-363222941859840
10-455485254371044352
11322516524038804660224
12-135316725169663246512128
1319655917963465137568481280

[1,0,-12,480,-18480,176640,149396544,-38742692352,
 6743113079040,-363222941859840,
 -455485254371044352,322516524038804660224,
 -135316725169663246512128,
 19655917963465137568481280]