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A167894 as a simple table

na(n)
01
1-1
2-1
3-3
4-13
5-71
6-461
7-3447
8-29093
9-273343
10-2829325
11-31998903
12-392743957
13-5201061455
14-73943424413
15-1123596277863
16-18176728317413
17-311951144828863
18-5661698774848621
19-108355864447215063

[1,-1,-1,-3,-13,-71,-461,-3447,-29093,-273343,
 -2829325,-31998903,-392743957,-5201061455,
 -73943424413,-1123596277863,-18176728317413,
 -311951144828863,-5661698774848621,
 -108355864447215063]