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A038821 as a simple table

na(n)
137607912018
273301896139
3108340298703
4142966208126
5177291661649
6211381427039
7245277688804
8279010070811
9312600354108
10346065536839
11379418886337
12412671294782
13445831610611
14478907544860
15511905471132

[37607912018,73301896139,108340298703,
 142966208126,177291661649,211381427039,
 245277688804,279010070811,312600354108,
 346065536839,379418886337,412671294782,
 445831610611,478907544860,511905471132]