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A019618 as a simple table

na(n)
01
121
2303
33745
442711
5464961
64918663
751086385
8524227671
95336085601
1054018566823
11544793838225
125480212349431
1355028108373441
14551863246323783
155529708675105265
1655374624529091991
17554289026917064481

[1,21,303,3745,42711,464961,4918663,51086385,
 524227671,5336085601,54018566823,544793838225,
 5480212349431,55028108373441,551863246323783,
 5529708675105265,55374624529091991,
 554289026917064481]