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A088857
as a simple table
n
a(n)
1
1
2
2
3
6
4
30
5
80
6
634
7
1424
8
5392
9
10677
10
38052
11
39051
12
815616
13
1421550
[1,2,6,30,80,634,1424,5392,10677,38052,39051, 815616,1421550]