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A027880 as a simple table

na(n)
01
111
21573
32716571
456328099685
514016177372718235
641852067359921313500005
71499635200191700040518673659035
8644815685260091508353787979063721364325
93327107302821620489265827570792988872583047378075

[1,11,1573,2716571,56328099685,14016177372718235,
 41852067359921313500005,
 1499635200191700040518673659035,
 644815685260091508353787979063721364325,
 3327107302821620489265827570792988872583047378075]