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A181895 as a simple table

na(n)
44
528
6176
71258
810070
990692
10907184
119979181
12119750111
131556754911
1421794572379
15326918591535
165230697470143
1788921857013919
181600593426385151
1930411275101997759
20608225502043759679

[4,28,176,1258,10070,90692,907184,9979181,
 119750111,1556754911,21794572379,326918591535,
 5230697470143,88921857013919,1600593426385151,
 30411275101997759,608225502043759679]