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A273305 as a simple table

na(n)
01
18
245
3212
4892
53785
615073
760181
8240725
9963953
103852705
1115423205
1261682933
13246690101
14986764713
153946987221

[1,8,45,212,892,3785,15073,60181,240725,963953,
 3852705,15423205,61682933,246690101,986764713,
 3946987221]