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A083234 as a simple table

na(n)
01
18
276
3752
47504
575008
6750016
77500032
875000064
9750000128
107500000256
1175000000512
12750000001024
137500000002048
1475000000004096
15750000000008192
167500000000016384
1775000000000032768
18750000000000065536

[1,8,76,752,7504,75008,750016,7500032,75000064,
 750000128,7500000256,75000000512,750000001024,
 7500000002048,75000000004096,750000000008192,
 7500000000016384,75000000000032768,
 750000000000065536]