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 A234729 #18 Sep 26 2024 15:08:35
%S A234729 0,6,23,55,108,187,297,443,631,866,1152,1496,1902,2376,2922,3547,4254,
%T A234729 5050,5940,6928,8020,9221,10536,11971,13531,15221,17045,19010,21121,
%U A234729 23382,25799,28377,31122,34038,37130,40405,43866,47520,51371,55425,59687
%N A234729 Volume of right regular hexagonal pyramid with height and side lengths n, rounded down.
%H A234729 Georg Fischer, <a href="/A234729/b234729.txt">Table of n, a(n) for n = 1..1000</a> [first 143 terms from _K. D. Bajpai_]
%F A234729 a(n) = floor(n^2*evalf(sqrt(3)*3/2)*n/3) = floor(0.8660254040* n^3).
%e A234729 a(7) = 297: Volume = n^2 * evalf(sqrt(3)*3/2)* n/3 = 297.0467136 and floor(297.0467136) = 297.
%p A234729 a:= n-> floor(sqrt(3*n^6/4)):
%p A234729 seq(a(n), n=1..100);
%t A234729 Table[Floor[k^3*0.8660254040],{k,1,100}]
%t A234729 Table[Floor[(Sqrt[3] n^3)/2],{n,100}] (* _Harvey P. Dale_, Apr 11 2020 *)
%o A234729 (PARI) a(n)=sqrtint(3*n^6\4) \\ _Charles R Greathouse IV_, Jan 08 2014
%Y A234729 Cf. A229063 (volume of square pyramid).
%K A234729 nonn,easy
%O A234729 1,2
%A A234729 _K. D. Bajpai_, Dec 30 2013