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 A018028 #13 Sep 08 2022 08:44:44
%S A018028 1,3,7,18,47,124,324,849,2225,5832,15284,40056,104976,275115,721005,
%T A018028 1889568,4952069,12978092,34012224,89137243,233605663,612220032,
%U A018028 1604470380,4204901941,11019960576,28880466844,75688234942,198359290368,519848403193,1362388228962
%N A018028 Powers of cube root of 18 rounded to nearest integer.
%H A018028 Vincenzo Librandi, <a href="/A018028/b018028.txt">Table of n, a(n) for n = 0..200</a>
%t A018028 Table[Round[18^(n/3)], {n, 0, 40}] (* _Vincenzo Librandi_, Jan 08 2014 *)
%t A018028 Round[Surd[18,3]^Range[0,40]] (* _Harvey P. Dale_, Nov 24 2017 *)
%o A018028 (Magma) [Round(18^(n/3)): n in [0..40]]; // _Vincenzo Librandi_, Jan 08 2014
%Y A018028 Cf. powers of cube root of k rounded up: A017980 (k=2), A017983 (k=3), A017986 (k=4), A017989 (k=5), A017992 (k=6), A017995 (k=7), A018001 (k=9), A018004 (k=10), A018007 (k=11), A018010 (k=12), A018013 (k=13), A018016 (k=14), A018019 (k=15), A018022 (k=16), A018025 (k=17), this sequence (k=18), A018031 (k=19), A018034 (k=20), A018037 (k=21), A018040 (k=22), A018043 (k=23), A018046 (k=24).
%K A018028 nonn
%O A018028 0,2
%A A018028 _N. J. A. Sloane_
%E A018028 More terms from _Vincenzo Librandi_, Jan 08 2014