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A009685 as a simple table

na(n)
01
10
2-28
3-448
412112
51368576
66365504
7-12034425856
8-1083196126976
9198483816038400
1067920087885661184
11-1384610933181693952
12-5947819353252706660352
13-1087299291711947739365376

[1,0,-28,-448,12112,1368576,6365504,-12034425856,
 -1083196126976,198483816038400,67920087885661184,
 -1384610933181693952,-5947819353252706660352,
 -1087299291711947739365376]