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A223128 as a simple table

na(n)
15
272
31154
428907
5444555
611814919
7186184618
85048458186
980664693231
102214177564958
1135719743830427
12988031616090509
1316048574199166554
14446266480581619794
157286115298409479410
16203387498405308227681

[5,72,1154,28907,444555,11814919,186184618,
 5048458186,80664693231,2214177564958,
 35719743830427,988031616090509,16048574199166554,
 446266480581619794,7286115298409479410,
 203387498405308227681]