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A013112 as a simple table

na(n)
01
14
2-8
370
4-920
5-28550
610642900
7-2554095050
8685535422000
9-219648785612750
1084602550046787500
11-38917136125065331250
1221166653214210218325000
13-13470291608750677967093750

[1,4,-8,70,-920,-28550,10642900,-2554095050,
 685535422000,-219648785612750,84602550046787500,
 -38917136125065331250,21166653214210218325000,
 -13470291608750677967093750]