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A218721 as a simple table

na(n)
00
11
219
3343
46175
5111151
62000719
736012943
8648232975
911668193551
10210027483919
113780494710543
1268048904789775
131224880286215951
1422047845151887119
15396861212733968143
167143501829211426575
17128583032925805678351

[0,1,19,343,6175,111151,2000719,36012943,
 648232975,11668193551,210027483919,3780494710543,
 68048904789775,1224880286215951,22047845151887119,
 396861212733968143,7143501829211426575,
 128583032925805678351]