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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.

A291991 as a simple table

na(n)
173
2530713
36481
447763361
542521761
6150094634909578633
713490012358249728401
8282429005041
919966781110160346782368664772328944885905284750420567849
101076050302914923449767311155851656076154481

[73,530713,6481,47763361,42521761,
 150094634909578633,13490012358249728401,
 282429005041,
 19966781110160346782368664772328944885905284750420\
 567849,
 1076050302914923449767311155851656076154481]