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A244828 as a simple table

na(n)
15
225
3117
4573
52833
613785
768311
8339839
91677913
108250991
1141042033
12202864491
131010570485
145010240575
1524786030031
16123527459073
17613216664859
183059004849315
1915214286790073
2075565229450871
21374920922490613

[5,25,117,573,2833,13785,68311,339839,1677913,
 8250991,41042033,202864491,1010570485,5010240575,
 24786030031,123527459073,613216664859,
 3059004849315,15214286790073,75565229450871,
 374920922490613]