A209339 - OEIS

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A209339 as a simple table

n	a(n)
1	1
2	4
3	7
4	35
5	145
6	770
7	4029
8	22739
9	130282
10	766177
11	4566523
12	27587850
13	168340643
14	1036444786
15	6429150260
16	40144480583

[1,4,7,35,145,770,4029,22739,130282,766177, 4566523,27587850,168340643,1036444786,6429150260, 40144480583]