A052315 - OEIS

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A052315 as a simple table

n	a(n)
1	1
2	4
3	17
4	83
5	432
6	2416
7	14093
8	85188
9	528234
10	3343420
11	21508182
12	140225532
13	924444270
14	6152191399
15	41275242100
16	278865583963
17	1895686831203
18	12956648332412
19	88984197144487
20	613773294727307
21	4250024962493357

[1,4,17,83,432,2416,14093,85188,528234,3343420, 21508182,140225532,924444270,6152191399, 41275242100,278865583963,1895686831203, 12956648332412,88984197144487,613773294727307, 4250024962493357]