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A012876 as a simple table

na(n)
01
10
21
3-3
44
5-40
6370
7-2100
819052
9-224712
102295380
11-27161420
12388309832
13-5572831680
1485093639488
15-1453531202760
1626088826973648
17-491011275101888
189922199896825168
19-211576194636993072

[1,0,1,-3,4,-40,370,-2100,19052,-224712,2295380,
 -27161420,388309832,-5572831680,85093639488,
 -1453531202760,26088826973648,-491011275101888,
 9922199896825168,-211576194636993072]