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A128482
as a simple table
n
a(n)
0
20
1
999
2
59886
3
5013752
4
604073400
5
105179890458
6
26398415877712
7
9510671755316374
[20,999,59886,5013752,604073400,105179890458, 26398415877712,9510671755316374]