A209002 - OEIS

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A209002 as a simple table

n	a(n)
1	1
2	1
3	3
4	5
5	13
6	46
7	157
8	608
9	2245
10	8184
11	30309
12	113476
13	428729
14	1637809
15	6309489
16	24478530
17	95532067
18	374703951

[1,1,3,5,13,46,157,608,2245,8184,30309,113476, 428729,1637809,6309489,24478530,95532067, 374703951]