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A012992 as a simple table

na(n)
02
1-17
2625
3-50095
46958465
5-1481513975
6447942184625
7-182407755827375
896230887606218625
9-63838323636651718375
1052010513762604762600625
11-51051665095162460001089375
1259420118823159622809910890625

[2,-17,625,-50095,6958465,-1481513975,
 447942184625,-182407755827375,96230887606218625,
 -63838323636651718375,52010513762604762600625,
 -51051665095162460001089375,
 59420118823159622809910890625]