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A251511 as a simple table

na(n)
1211680
218567350
31644478410
4148463964846
513364799461286
61208313756081050
7109013443872596196
89858043579853849290
9890078709570970720374
1080492180151559856136298
117270622635420927300366604

[211680,18567350,1644478410,148463964846,
 13364799461286,1208313756081050,
 109013443872596196,9858043579853849290,
 890078709570970720374,80492180151559856136298,
 7270622635420927300366604]