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A221928 as a simple table

na(n)
128
220933
36888458
42568601026
5938516646422
6344170748565832
7126100252425009531
846209296640385349436
916932783333617347990176

[28,20933,6888458,2568601026,938516646422,
 344170748565832,126100252425009531,
 46209296640385349436,16932783333617347990176]