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A010826 as a simple table

na(n)
01
1-20
2170
3-760
41615
5476
6-11210
722440
81615
9-64600
1060002
1151680
12-9520
13-213180
14-83980
15803528
16-379525
17-692360
18119700
1980920
201899830
21-1235360
22-755990
23-1200040
24-1981435
258388956
26-361760
27-5068440

[1,-20,170,-760,1615,476,-11210,22440,1615,-64600,
 60002,51680,-9520,-213180,-83980,803528,-379525,
 -692360,119700,80920,1899830,-1235360,-755990,
 -1200040,-1981435,8388956,-361760,-5068440]