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 A018034 #17 Sep 08 2022 08:44:44
%S A018034 1,3,7,20,54,147,400,1086,2947,8000,21715,58945,160000,434307,1178890,
%T A018034 3200000,8686136,23577802,64000000,173722727,471556032,1280000000,
%U A018034 3474454549,9431120637,25600000000,69489090985,188622412730,512000000000,1389781819697
%N A018034 Powers of cube root of 20 rounded to nearest integer.
%H A018034 Vincenzo Librandi, <a href="/A018034/b018034.txt">Table of n, a(n) for n = 0..200</a>
%t A018034 Table[Round[20^(n/3)], {n, 0, 40}] (* _Vincenzo Librandi_, Jan 08 2014 *)
%t A018034 Table[Round[Surd[20,3]^n],{n,0,40}] (* _Harvey P. Dale_, Sep 10 2021 *)
%o A018034 (Magma) [Round(20^(n/3)): n in [0..40]]; // _Vincenzo Librandi_, Jan 08 2014
%Y A018034 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), A018028 (k=18), A018031 (k=19), this sequence (k=20), A018037 (k=21), A018040 (k=22), A018043 (k=23), A018046 (k=24).
%K A018034 nonn
%O A018034 0,2
%A A018034 _N. J. A. Sloane_
%E A018034 More terms from _Vincenzo Librandi_, Jan 08 2014