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A028227 as a simple table

na(n)
01
139
2958
318966
4330883
55313693
680518096
71169149692
816435587685
9225292911987
103026941267714
1140015278899778
12522017655765607
136735488552529321
1486110477932406612
151092366397140622824

[1,39,958,18966,330883,5313693,80518096,
 1169149692,16435587685,225292911987,3026941267714,
 40015278899778,522017655765607,6735488552529321,
 86110477932406612,1092366397140622824]