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A013019 as a simple table

na(n)
00
12
2-1
311
4-30
5207
6-1095
78304
8-64372
9589941
10-5860125
1164691794
12-775311174
1310085421751
14-141164863203
152117691780304
16-33881891414760
17576001188753673
18-10367968207899897
19196991835391515262

[0,2,-1,11,-30,207,-1095,8304,-64372,589941,
 -5860125,64691794,-775311174,10085421751,
 -141164863203,2117691780304,-33881891414760,
 576001188753673,-10367968207899897,
 196991835391515262]