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A269447 as a simple table

na(n)
17
217
3881
41351
542787
665337
72053401
83135331
998520967
10150431057
114726953521
127217555911
13226795248547
14346292253177
1510881444977241
1616614810597091
17522082563659527
18797164616407697
1925049081610680561
2038247286776972871
211201833834749007907

[7,17,881,1351,42787,65337,2053401,3135331,
 98520967,150431057,4726953521,7217555911,
 226795248547,346292253177,10881444977241,
 16614810597091,522082563659527,797164616407697,
 25049081610680561,38247286776972871,
 1201833834749007907]