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A252209 as a simple table

na(n)
1278710
22568954
365275092
4301990806
510519316686
6267361717782
71236950586236
843087111929354
91095113581291852
105066549580829014
11176484810397704526
124485585228861223254
1320752587082923540860

[278710,2568954,65275092,301990806,10519316686,
 267361717782,1236950586236,43087111929354,
 1095113581291852,5066549580829014,
 176484810397704526,4485585228861223254,
 20752587082923540860]