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A084575
as a simple table
n
a(n)
1
1
2
2
3
4
4
10
5
26
6
68
7
246
8
810
9
2704
10
7492
11
32066
12
86500
13
400024
14
1366500
15
4614524
16
18784170
17
68635478
[1,2,4,10,26,68,246,810,2704,7492,32066,86500, 400024,1366500,4614524,18784170,68635478]