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A064616 as a simple table

na(n)
19
289
3789
46789
556789
6456789
73456789
823456789
9123456789
10123456789
11-9876543211
12-209876543211
13-3209876543211
14-43209876543211
15-543209876543211
16-6543209876543211
17-76543209876543211
18-876543209876543211
19-9876543209876543211

[9,89,789,6789,56789,456789,3456789,23456789,
 123456789,123456789,-9876543211,-209876543211,
 -3209876543211,-43209876543211,-543209876543211,
 -6543209876543211,-76543209876543211,
 -876543209876543211,-9876543209876543211]