This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A018053 #8 Jul 08 2025 06:22:09 %S A018053 1,2,2,3,3,4,6,7,9,12,16,21,27,36,47,62,81,107,141,185,243,320,421, %T A018053 554,729,960,1263,1662,2187,2879,3788,4986,6561,8635,11364,14956, %U A018053 19683,25905,34092,44868,59049,77713 %N A018053 Powers of fourth root of 3 rounded up. %t A018053 Ceiling[Surd[3,4]^Range[0,50]] (* _Harvey P. Dale_, Jul 27 2022 *) %K A018053 nonn %O A018053 0,2 %A A018053 _N. J. A. Sloane_