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A012434 as a simple table

na(n)
02
1-4
2278
3-6984
41148202
5-99018060
628635818430
7-5588393370000
82487224151815250
9-886910985311966100
10563430775878809461350
11-321709990033199535312600
12277763298278504193429092730

[2,-4,278,-6984,1148202,-99018060,28635818430,
 -5588393370000,2487224151815250,
 -886910985311966100,563430775878809461350,
 -321709990033199535312600,
 277763298278504193429092730]