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A009076 as a simple table

na(n)
01
10
2-1
3-6
4-31
5-140
6-577
7-1498
86785
9192840
102667711
1131783730
12353106657
133771795196
1438270910975
15356214219678
162639000258561
174515406498320
18-420731049845121
19-13553517751217174
20-318084517098105631

[1,0,-1,-6,-31,-140,-577,-1498,6785,192840,
 2667711,31783730,353106657,3771795196,38270910975,
 356214219678,2639000258561,4515406498320,
 -420731049845121,-13553517751217174,
 -318084517098105631]