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 A014793 #16 Apr 16 2022 11:35:47 %S A014793 1,441,4225,17689,50625,116281,231361,416025,693889,1092025,1640961, %T A014793 2374681,3330625,4549689,6076225,7958041,10246401,12996025,16265089, %U A014793 20115225,24611521,29822521,35820225,42680089,50481025,59305401 %N A014793 Squares of odd octagonal numbers. %H A014793 <a href="/index/Rec#order_05">Index entries for linear recurrences with constant coefficients</a>, signature (5,-10,10,-5,1). %F A014793 G.f.: (-25*x^4 - 964*x^3 - 2030*x^2 - 436*x - 1)/(x-1)^5. - Maksym Voznyy (voznyy(AT)mail.ru), Aug 11 2009 %F A014793 a(n) = ((1 + 2*n)*(1 + 6*n))^2. - _Stefano Spezia_, Apr 16 2022 %Y A014793 Cf. A000567, A014641, A014642, A014794. %K A014793 nonn,easy %O A014793 0,2 %A A014793 _Mohammad K. Azarian_ %E A014793 More terms from _Patrick De Geest_, Aug 15 2000