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A208934 as a simple table

na(n)
18
27
36
43
51
65
720
86
91
10-1
111000000000000000000000000000000000000000000000000
1211
131000000
141
151000000
161000000000000000000000000000000000000000000
171000000000000000000000000
183
191
208
219
224
232
241000000000000000000000000000000000000
25-1
262
27-1
2812
295
3030

[8,7,6,3,1,5,20,6,1,-1,
 1000000000000000000000000000000000000000000000000,
 11,1000000,1,1000000,
 1000000000000000000000000000000000000000000,
 1000000000000000000000000,3,1,8,9,4,2,
 1000000000000000000000000000000000000,-1,2,-1,12,
 5,30]