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A012537 as a simple table

na(n)
02
18
2-160
3-11072
459008
5103467520
69545313024
7-2353856581632
8-975598930427904
937877907269697536
10166837459499821137920
1145962446989093848219648
12-37193338901666118751944704

[2,8,-160,-11072,59008,103467520,9545313024,
 -2353856581632,-975598930427904,37877907269697536,
 166837459499821137920,45962446989093848219648,
 -37193338901666118751944704]