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 A018000 #16 Sep 08 2022 08:44:44
%S A018000 1,2,4,9,18,38,81,168,350,729,1516,3154,6561,13647,28387,59049,122826,
%T A018000 255490,531441,1105441,2299411,4782969,9948976,20694704,43046721,
%U A018000 89540787,186252344,387420489,805867091,1676271101,3486784401,7252803826,15086439912
%N A018000 Powers of cube root of 9 rounded down.
%H A018000 Vincenzo Librandi, <a href="/A018000/b018000.txt">Table of n, a(n) for n = 0..200</a>
%p A018000 A018000:=n->floor(9^(n/3)); seq(A018000(n), n=0..50); # _Wesley Ivan Hurt_, Jan 16 2014
%t A018000 Table[Floor[9^(n/3)], {n, 0, 40}] (* _Vincenzo Librandi_, Jan 06 2014 *)
%o A018000 (Magma) [Floor(9^(n/3)): n in [0..50]]; // _Vincenzo Librandi_, Jan 06 2014
%Y A018000 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), this sequence (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), A018027 (k=18), A018030 (k=19), A018033 (k=20), A018036 (k=21), A018039 (k=22), A018042 (k=23), A018045 (k=24).
%K A018000 nonn
%O A018000 0,2
%A A018000 _N. J. A. Sloane_
%E A018000 More terms from _Vincenzo Librandi_, Jan 06 2014