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A208438 as a simple table

na(n)
13
228
31548
4505000
5964650992
610739447120572
7697471372604833664
8264039217624146229066192
9582845798190981709618659494484
107500713445239384698086219757987132164

[3,28,1548,505000,964650992,10739447120572,
 697471372604833664,264039217624146229066192,
 582845798190981709618659494484,
 7500713445239384698086219757987132164]