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A012344 as a simple table

na(n)
01
10
2-12
3-240
4-7728
5-428160
6-37912512
7-4960720128
8-901797013248
9-217415865765888
10-67097095431416832
11-25783170924788428800
12-12066773451365568000000
13-6755136268249010663424000

[1,0,-12,-240,-7728,-428160,-37912512,-4960720128,
 -901797013248,-217415865765888,-67097095431416832,
 -25783170924788428800,-12066773451365568000000,
 -6755136268249010663424000]