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A013119 as a simple table

na(n)
00
12
2-1
38
4-30
5358
6-2655
741428
8-511980
99864538
10-171757845
113961279808
12-88981176570
132406642164782
14-65936688564747
152056690243987468
16-66255959470897560
172349481394958302898
18-86780043600660006633

[0,2,-1,8,-30,358,-2655,41428,-511980,9864538,
 -171757845,3961279808,-88981176570,2406642164782,
 -65936688564747,2056690243987468,
 -66255959470897560,2349481394958302898,
 -86780043600660006633]