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A181895 as a simple table

n a(n)
4 4
5 28
6 176
7 1258
8 10070
9 90692
10 907184
11 9979181
12 119750111
13 1556754911
14 21794572379
15 326918591535
16 5230697470143
17 88921857013919
18 1600593426385151
19 30411275101997759
20 608225502043759679

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

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Last modified September 18 09:59 EDT 2019. Contains 327170 sequences. (Running on oeis4.)