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A253657 as a simple table

na(n)
13550
225062
3241548
42113406
517719343
6152352910
71302707432
811094507660
994827318012
10808751503976
116903022252385
1258900473067302
13502630468746850
144288654203577526
1536596735470949736
16312258842250198756

[3550,25062,241548,2113406,17719343,152352910,
 1302707432,11094507660,94827318012,808751503976,
 6903022252385,58900473067302,502630468746850,
 4288654203577526,36596735470949736,
 312258842250198756]