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A099825 as a simple table

na(n)
02
15
217
377
4381
51851
68893
741741
8191755
9868151
103875933
1117120309
1274950547
13325590115
141405167561
156029676711
1625750781177
17109495928099
18463852117169
191958476902435
208244703036797
2134615624751259
22144991244981985

[2,5,17,77,381,1851,8893,41741,191755,868151,
 3875933,17120309,74950547,325590115,1405167561,
 6029676711,25750781177,109495928099,463852117169,
 1958476902435,8244703036797,34615624751259,
 144991244981985]