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 A017991 #13 Apr 10 2025 15:57:54
%S A017991 1,1,3,6,10,19,36,65,118,216,392,713,1296,2354,4279,7776,14129,25675,
%T A017991 46656,84779,154054,279936,508677,924328,1679616,3052064,5545969,
%U A017991 10077696,18312388,33275819,60466176,109874333,199654914,362797056,659246001
%N A017991 Powers of cube root of 6 rounded down.
%H A017991 Vincenzo Librandi, <a href="/A017991/b017991.txt">Table of n, a(n) for n = 0..200</a>
%t A017991 Table[Floor[6^(n/3)], {n, 0, 40}] (* _Vincenzo Librandi_, Jan 06 2014 *)
%t A017991 Floor[CubeRoot[6]^Range[0,40]]
%o A017991 (Magma) [Floor(6^(n/3)): n in [0..50]]; // _Vincenzo Librandi_, Jan 06 2014
%Y A017991 Cf. powers of cube root of k rounded down: A017979 (k=2), A017982 (k=3), A017985 (k=4), A017988 (k=5), this sequence (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), A018027 (k=18), A018030 (k=19), A018033 (k=20), A018036 (k=21), A018039 (k=22), A018042 (k=23), A018045 (k=24).
%K A017991 nonn
%O A017991 0,3
%A A017991 _N. J. A. Sloane_
%E A017991 More terms from _Vincenzo Librandi_, Jan 06 2014