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A345246
as a simple table
n
a(n)
4
1
5
2
6
6
7
16
8
78
9
415
10
3374
11
35860
12
524386
13
10193061
14
263036202
15
8948113645
16
400280198048
[1,2,6,16,78,415,3374,35860,524386,10193061, 263036202,8948113645,400280198048]