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A304598
as a simple table
n
a(n)
1
1
2
4
3
13
4
73
5
560
6
6007
7
75463
8
1874284
9
62934491
10
2085910493
11
94776909801
12
7409071360844
13
887762245576310
[1,4,13,73,560,6007,75463,1874284,62934491, 2085910493,94776909801,7409071360844, 887762245576310]