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A012829 as a simple table

na(n)
01
10
20
3-504
411904
5-1023616
6190103680
7-27296677888
86616599617536
9-2038987281108992
10733961541487493120
11-333541890591777587200
12180073909555827471974400
13-114101788265471646305353728

[1,0,0,-504,11904,-1023616,190103680,-27296677888,
 6616599617536,-2038987281108992,
 733961541487493120,-333541890591777587200,
 180073909555827471974400,
 -114101788265471646305353728]