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A189252 as a simple table

na(n)
121
2456320
31070959431
45025023852501
519568579061640704
681032653651506521333
7330453235652954061843137
81355117057188899341581651072
95550437831744113835993347187363

[21,456320,1070959431,5025023852501,
 19568579061640704,81032653651506521333,
 330453235652954061843137,
 1355117057188899341581651072,
 5550437831744113835993347187363]