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A075081 as a simple table

na(n)
127
22187
31594323
47509466514979724803946715958257547
513915193059764305937984450503671774362956903094027

[27,2187,1594323,
 7509466514979724803946715958257547,
 13915193059764305937984450503671774362956903094027\
 ]