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A321214 as a simple table

na(n)
15
220
3260
43460
5716100
610877380
72678663940
843007216580
911439823225220
1052423583379994820
11880012516784503300
124260164250933079388740
131237929447780495036788100
1421180545285375859022020420
156239638330555928133105753860

[5,20,260,3460,716100,10877380,2678663940,
 43007216580,11439823225220,52423583379994820,
 880012516784503300,4260164250933079388740,
 1237929447780495036788100,
 21180545285375859022020420,
 6239638330555928133105753860]