A066331 - OEIS

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A066331 as a simple table

n	a(n)
1	1
2	3
3	9
4	29
5	99
6	348
7	1260
8	4644
9	17382
10	65822
11	251655
12	969819
13	3762517
14	14680890
15	57567228
16	226712655
17	896252850
18	3555116583
19	14144563158

[1,3,9,29,99,348,1260,4644,17382,65822,251655, 969819,3762517,14680890,57567228,226712655, 896252850,3555116583,14144563158]