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A221577 as a simple table

na(n)
116
2345
34240
426911
5117104
6395641
71116400
82754635
96127696
1012553189
1124049616
1243584535
1375375280
14125247281
15201055024
16313170691
17475045520
18703848925
191021190416
201453929359
212035077616
222804800105
233811518320

[16,345,4240,26911,117104,395641,1116400,2754635,
 6127696,12553189,24049616,43584535,75375280,
 125247281,201055024,313170691,475045520,703848925,
 1021190416,1453929359,2035077616,2804800105,
 3811518320]