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A262423 as a simple table

na(n)
121
248
31701
418228
5428301
67577424
7163388421
83287265300
969481709901
101443547193328
1130363542104581
12635919555126708
1313359727300650381
14280364385485387664
155888252348126720901
16123632237885054793300

[21,48,1701,18228,428301,7577424,163388421,
 3287265300,69481709901,1443547193328,
 30363542104581,635919555126708,13359727300650381,
 280364385485387664,5888252348126720901,
 123632237885054793300]