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 A057671 #11 Jul 02 2025 16:02:00
%S A057671 0,3,12,30,59,102,163,243,347,476,634,823,1046,1307,1607,1951,2340,
%T A057671 2778,3267,3811,4411,5072,5796,6585,7443,8373,9377,10457,11618,12862,
%U A057671 14192,15610,17120,18724,20425,22226,24131
%N A057671 a(n) equals floor(Vc(n) - Vs(n)), where Vc(n) is the volume of the cube with side length n and Vs(n) is the volume of the sphere of diameter n.
%F A057671 a(n) = floor(n^3*(1-Pi/6)).
%e A057671 a(7)=163 because 163=floor(7^3*(1-Pi/6)).
%t A057671 Table[Floor[n^3 (1-\[Pi]/6)],{n,40}] (* _Harvey P. Dale_, Apr 24 2011 *)
%Y A057671 Cf. A057672.
%K A057671 nonn
%O A057671 1,2
%A A057671 seiringer.flor(AT)eudoramail.com, Oct 18 2000
%E A057671 Edited by _James Sellers_, Oct 20 2000