A118339 - OEIS

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A118339 as a simple table

n	a(n)
1	1
2	3
3	15
4	63
5	267
6	1107
7	4623
8	19071
9	78987
10	324543
11	1337511
12	5483235
13	22527315
14	92200455
15	377965479
16	1544925891
17	6322891707

[1,3,15,63,267,1107,4623,19071,78987,324543, 1337511,5483235,22527315,92200455,377965479, 1544925891,6322891707]