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A012848 as a simple table

na(n)
01
13
2-15
3-1869
4-88959
5202499
6974640433
7190241481587
815481756625281
9-5564353308576125
10-3510791865515349775
11-961065703006847944525
1292025876595389114977025
13299254465799630697304777347

[1,3,-15,-1869,-88959,202499,974640433,
 190241481587,15481756625281,-5564353308576125,
 -3510791865515349775,-961065703006847944525,
 92025876595389114977025,
 299254465799630697304777347]