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A012863 as a simple table

na(n)
00
1-1
2-1
3-1
43
5-19
659
7-751
8174989
9-2857
102249927
11-434293
1232401403009
13-8181904909
141150205658377
15-5044289
1664371087485333
17-5026792806787
183500507461200889
19-69028763155644023
2067179942704167004419
21-1022779523247467
22348074852007121792219
23-750218743980105669781
24129827894444079903690116761

[0,-1,-1,-1,3,-19,59,-751,174989,-2857,2249927,
 -434293,32401403009,-8181904909,1150205658377,
 -5044289,64371087485333,-5026792806787,
 3500507461200889,-69028763155644023,
 67179942704167004419,-1022779523247467,
 348074852007121792219,-750218743980105669781,
 129827894444079903690116761]