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A191506 as a simple table

na(n)
12
25
325
4195
52475
653324
71872113
8109037035
910508450377
101672058437225
11440124911303718
12191498508664286039
13137739615464486164780
14163796811382099494131871
15322006666961136384120723488

[2,5,25,195,2475,53324,1872113,109037035,
 10508450377,1672058437225,440124911303718,
 191498508664286039,137739615464486164780,
 163796811382099494131871,
 322006666961136384120723488]