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A203887 as a simple table

na(n)
1637
28281
38281
4107653
5254359
6107653
71399489
87501753
97501753
101399489
1118193357
12222645367
13543848893
14222645367
1518193357
16236513641
176601376089
1839572771665
1939572771665
206601376089
21236513641
223074677333
23195759462871

[637,8281,8281,107653,254359,107653,1399489,
 7501753,7501753,1399489,18193357,222645367,
 543848893,222645367,18193357,236513641,6601376089,
 39572771665,39572771665,6601376089,236513641,
 3074677333,195759462871]