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A116603 as a simple table

na(n)
01
12
2-1
34
4-21
5138
6-1091
710088
8-106918
91279220
10-17070418
11251560472
12-4059954946
1371250808916
14-1351381762990
1527552372478592
16-601021307680207
1713969016314470386
18-344653640328891233
198997206549370634644

[1,2,-1,4,-21,138,-1091,10088,-106918,1279220,
 -17070418,251560472,-4059954946,71250808916,
 -1351381762990,27552372478592,-601021307680207,
 13969016314470386,-344653640328891233,
 8997206549370634644]