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A012768 as a simple table

na(n)
01
11
21
32
45
520
685
716
8-887
914096
10145865
11-887456
12-14963507
13126998976
142554796829
15-21834514688
16-556819358703
175067177011456
18157094249035537
19-1485621376751104
20-55286734778859115

[1,1,1,2,5,20,85,16,-887,14096,145865,-887456,
 -14963507,126998976,2554796829,-21834514688,
 -556819358703,5067177011456,157094249035537,
 -1485621376751104,-55286734778859115]