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A117141 as a simple table

na(n)
12
27
347
4383
510321919
651011754393599
71130138339199322632554990773529330319359999999
873562883979319395645666688474019139929848516028923903999999999

[2,7,47,383,10321919,51011754393599,
 1130138339199322632554990773529330319359999999,
 73562883979319395645666688474019139929848516028923\
 903999999999]