A016134 - OEIS

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A016134 as a simple table

n	a(n)
0	1
1	12
2	124
3	1248
4	12496
5	124992
6	1249984
7	12499968
8	124999936
9	1249999872
10	12499999744
11	124999999488
12	1249999998976
13	12499999997952
14	124999999995904
15	1249999999991808
16	12499999999983616
17	124999999999967232

[1,12,124,1248,12496,124992,1249984,12499968, 124999936,1249999872,12499999744,124999999488, 1249999998976,12499999997952,124999999995904, 1249999999991808,12499999999983616, 124999999999967232]