A007198 - OEIS

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A007198 as a simple table

n	a(n)
1	1
2	3
3	12
4	52
5	238
6	1125
7	5438
8	26715
9	132871
10	667312
11	3377906
12	17210522
13	88169685
14	453810095
15	2345209383
16	12162367228
17	63270384303

[1,3,12,52,238,1125,5438,26715,132871,667312, 3377906,17210522,88169685,453810095,2345209383, 12162367228,63270384303]