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A012193 as a simple table

na(n)
01
1-1
217
3-721
458337
5-7657441
61482169457
7-396854618161
8140415423261377
9-63432792091634881
1035619694647751942097
11-24334169873267896659601
1219872330538404158435859617

[1,-1,17,-721,58337,-7657441,1482169457,
 -396854618161,140415423261377,-63432792091634881,
 35619694647751942097,-24334169873267896659601,
 19872330538404158435859617]