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A021404 as a simple table

na(n)
01
120
2285
33640
444681
5540540
66505045
778138080
8937976961
911257033060
10135089723405
111621098253320
1219453266126841
13233439544261580
142801275941271365
1533615316957309360
16403383826200494321

[1,20,285,3640,44681,540540,6505045,78138080,
 937976961,11257033060,135089723405,1621098253320,
 19453266126841,233439544261580,2801275941271365,
 33615316957309360,403383826200494321]