A342807 - OEIS

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A342807 as a simple table

n	a(n)
0	1
1	6
2	30
3	150
4	750
5	3750
6	18630
7	92406
8	458262
9	2270478
10	11245590
11	55697766
12	275769654
13	1365260862
14	6758345838
15	33450929886
16	165549052326
17	819248589606
18	4054005363918

[1,6,30,150,750,3750,18630,92406,458262,2270478, 11245590,55697766,275769654,1365260862,6758345838, 33450929886,165549052326,819248589606, 4054005363918]