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A009426 as a simple table

na(n)
00
11
2-1
35
4-12
589
6-345
73093
8-17136
9182097
10-1334025
1116371365
12-150969324
132101489961
14-23556117585
15367038504693
16-4870660226880
1784100519126561
18-1293871061371761
1924562906630580293
20-430689316852061740

[0,1,-1,5,-12,89,-345,3093,-17136,182097,-1334025,
 16371365,-150969324,2101489961,-23556117585,
 367038504693,-4870660226880,84100519126561,
 -1293871061371761,24562906630580293,
 -430689316852061740]