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A240798 as a simple table

na(n)
10
20
31
412
5130
61500
718935
8262248
93972612
1065500200
111169398065
1222494463860
13464072915878
1410225330604580
15239720548513355
165959152063448080
17156592569864940040
184337574220496785680
19126329273251232688069
203859509516112803668220
21123426111134706786806890

[0,0,1,12,130,1500,18935,262248,3972612,65500200,
 1169398065,22494463860,464072915878,
 10225330604580,239720548513355,5959152063448080,
 156592569864940040,4337574220496785680,
 126329273251232688069,3859509516112803668220,
 123426111134706786806890]