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A172614 as a simple table

na(n)
10
21
3227873431500
430862498453931119524941700
5303467065300162961503136931771371140440000
698744132720453916340813668495424059077053759331765698612500

[0,1,227873431500,30862498453931119524941700,
 303467065300162961503136931771371140440000,
 98744132720453916340813668495424059077053759331765\
 698612500]