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 A104008 #24 Jun 09 2020 20:20:35
%S A104008 120,25080,4890480,949077360,184120982760,35718589344360,
%T A104008 6929223155685600,1344233586759971040,260774386791383159640,
%U A104008 50588886806491889178840,9813983266108156439587920,1903862164738670605583434320,369339445976042880280120411080
%N A104008 Area of (m,m+1,m+1)-integer triangle for m in A103975.
%H A104008 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (208, -2718, 208, -1).
%F A104008 a(n) = (m/4)*sqrt((3*m+2)*(m+2)), where m=A103975(n).
%F A104008 G.f.: 120*x*(x+1) / ((x^2-194*x+1)*(x^2-14*x+1)). - _Colin Barker_, Apr 10 2013
%t A104008 LinearRecurrence[{208,-2718,208,-1},{120,25080,4890480,949077360},20] (* _Harvey P. Dale_, Mar 06 2017 *)
%Y A104008 Cf. A103975.
%K A104008 nonn,easy
%O A104008 1,1
%A A104008 _Zak Seidov_, Feb 24 2005
%E A104008 More terms from _Max Alekseyev_, May 31 2007
%E A104008 More terms from _Colin Barker_, Apr 10 2013