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A371251 as a simple table

na(n)
21
3144
46046
5149674
62771028
742679084
8578872364
97153349724
1082324041285
11895669007200
129311524010712
1393235420275816
14904560813228072
158543205886920516
1678838778199275032
17713005588584772184
186334935141516816267
1955407394283320881984

[1,144,6046,149674,2771028,42679084,578872364,
 7153349724,82324041285,895669007200,9311524010712,
 93235420275816,904560813228072,8543205886920516,
 78838778199275032,713005588584772184,
 6334935141516816267,55407394283320881984]