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A342807 as a simple table

na(n)
01
16
230
3150
4750
53750
618630
792406
8458262
92270478
1011245590
1155697766
12275769654
131365260862
146758345838
1533450929886
16165549052326
17819248589606
184054005363918

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