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A221820 as a simple table

na(n)
10
240
3379
429412
5854959
635948127
71290833232
849447514716
91844208808987
1069554410132666
112610306743813999
1298167800387966673

[0,40,379,29412,854959,35948127,1290833232,
 49447514716,1844208808987,69554410132666,
 2610306743813999,98167800387966673]