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A218207
as a simple table
n
a(n)
1
1
2
3
3
6
4
16
5
42
6
107
7
286
8
764
9
2124
10
5917
11
17250
12
49818
13
145429
[1,3,6,16,42,107,286,764,2124,5917,17250,49818, 145429]