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A189317 as a simple table

n a(n)
0 5
1 20
2 180
3 1700
4 16100
5 152500
6 1444500
7 13682500
8 129602500
9 1227612500
10 11628112500
11 110143062500
12 1043290062500
13 9882185312500
14 93605402812500
15 886643101562500
16 8398404001562500
17 79550824507812500
18 753516225070312500
19 7137408128164062500

[5,20,180,1700,16100,152500,1444500,13682500,
 129602500,1227612500,11628112500,110143062500,
 1043290062500,9882185312500,93605402812500,
 886643101562500,8398404001562500,
 79550824507812500,753516225070312500,
 7137408128164062500]

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Last modified July 24 05:21 EDT 2019. Contains 325290 sequences. (Running on oeis4.)