0,3
3^i then 3^(i+1) - 1.
Cf. A030283.
Sequence in context: A103026 A098506 A085453 this_sequence A119386 A140484 A087034
Adjacent sequences: A030436 A030437 A030438 this_sequence A030440 A030441 A030442
nonn,base
njas
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