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A028007 as a simple table

n a(n)
0 1
1 28
2 511
3 7722
4 105105
5 1340976
6 16393987
7 194632774
8 2263422469
9 25933837644
10 293957202903
11 3305777399106
12 36960914527993
13 411484609521832
14 4566596614746859
15 50561336628369918
16 558851419944076077

[1,28,511,7722,105105,1340976,16393987,194632774,
 2263422469,25933837644,293957202903,3305777399106,
 36960914527993,411484609521832,4566596614746859,
 50561336628369918,558851419944076077]

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Last modified May 20 20:15 EDT 2022. Contains 353876 sequences. (Running on oeis4.)