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A122113
as a simple table
n
a(n)
4
1
5
1
6
4
7
6
8
28
9
77
10
386
11
1787
12
10354
13
62040
14
404093
15
2725484
16
19078248
[1,1,4,6,28,77,386,1787,10354,62040,404093, 2725484,19078248]