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A159031 as a simple table

na(n)
117
2107
310007
4100000007
51000000007
61000000000000000000000007
71000000000000000000000000000000000000000000000000000000000007

[17,107,10007,100000007,1000000007,
 1000000000000000000000007,
 10000000000000000000000000000000000000000000000000\
 00000000007]