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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.

A012888 as a simple table

na(n)
00
12
2-1
3-7
418
5-13
6135
7-1614
810612
9-71215
10637515
11-6443034
1267830114
13-769960735
149523596355
15-126475570464
161788373677960
17-26860585215767
18427142221117623
19-7163185240710714
20126244734481260190

[0,2,-1,-7,18,-13,135,-1614,10612,-71215,637515,
 -6443034,67830114,-769960735,9523596355,
 -126475570464,1788373677960,-26860585215767,
 427142221117623,-7163185240710714,
 126244734481260190]