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A221313
as a simple table
n
a(n)
1
1
2
4
3
9
4
23
5
57
6
142
7
353
8
878
9
2183
10
5428
11
13496
12
33556
13
83432
14
207441
15
515770
16
1282382
17
3188443
[1,4,9,23,57,142,353,878,2183,5428,13496,33556, 83432,207441,515770,1282382,3188443]