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 A018027 #12 Sep 08 2022 08:44:44
%S A018027 1,2,6,18,47,123,324,849,2225,5832,15284,40055,104976,275114,721005,
%T A018027 1889568,4952069,12978092,34012224,89137243,233605663,612220032,
%U A018027 1604470380,4204901941,11019960576,28880466844,75688234942,198359290368,519848403193,1362388228962
%N A018027 Powers of cube root of 18 rounded down.
%H A018027 Vincenzo Librandi, <a href="/A018027/b018027.txt">Table of n, a(n) for n = 0..200</a>
%t A018027 Table[Floor[18^(n/3)], {n, 0, 40}] (* _Vincenzo Librandi_, Jan 06 2014 *)
%o A018027 (Magma) [Floor(18^(n/3)): n in [0..40]]; // _Vincenzo Librandi_, Jan 06 2014
%Y A018027 Cf. powers of cube root of k rounded down: A017979 (k=2), A017982 (k=3), A017985 (k=4), A017988 (k=5), A017991 (k=6), A017994 (k=7), A018000 (k=9), A018003 (k=10), A018006 (k=11), A018009 (k=12), A018012 (k=13), A018015 (k=14), A018018 (k=15), A018021 (k=16), A018024 (k=17), this sequence (k=18), A018030 (k=19), A018033 (k=20), A018036 (k=21), A018039 (k=22), A018042 (k=23), A018045 (k=24).
%K A018027 nonn
%O A018027 0,2
%A A018027 _N. J. A. Sloane_
%E A018027 More terms from _Vincenzo Librandi_, Jan 06 2014