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A012544 as a simple table

na(n)
01
10
2-12
3-240
41680
5660480
639530304
7-3855231744
8-1466146656000
9-147651751649280
1043245441015313408
1121785411128189063168
12453349606338812022784
13-4374564365537166405795840

[1,0,-12,-240,1680,660480,39530304,-3855231744,
 -1466146656000,-147651751649280,43245441015313408,
 21785411128189063168,453349606338812022784,
 -4374564365537166405795840]