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A155335
as a simple table
n
a(n)
6
1
7
7
8
19
9
58
10
199
11
688
12
3581
13
19670
14
126183
15
979162
16
8439890
17
86791208
18
1020461563
[1,7,19,58,199,688,3581,19670,126183,979162, 8439890,86791208,1020461563]