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A073507
as a simple table
n
a(n)
1
1
2
6
3
46
4
308
5
2411
6
19621
7
166211
8
1440495
9
12712314
10
113764039
11
1029518337
12
9401997000
13
86516367790
[1,6,46,308,2411,19621,166211,1440495,12712314, 113764039,1029518337,9401997000,86516367790]