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 A017234 #18 Sep 08 2022 08:44:42 %S A017234 36,225,576,1089,1764,2601,3600,4761,6084,7569,9216,11025,12996,15129, %T A017234 17424,19881,22500,25281,28224,31329,34596,38025,41616,45369,49284, %U A017234 53361,57600,62001,66564,71289 %N A017234 a(n) = (9*n + 6)^2. %H A017234 Vincenzo Librandi, <a href="/A017234/b017234.txt">Table of n, a(n) for n = 0..10000</a> %H A017234 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (3,-3,1). %F A017234 From _R. J. Mathar_, Mar 21 2016: (Start) %F A017234 G.f.: ( -36 - 117*x - 9*x^2 ) / (x-1)^3. %F A017234 a(n) = 9*A016790(n). (End) %o A017234 (Magma) [(9*n+6)^2: n in [0..35]]; // _Vincenzo Librandi_, Jul 25 2011 %o A017234 (PARI) a(n) = (9*n+6)^2; \\ _Altug Alkan_, Mar 21 2016 %Y A017234 Cf. A000290 (n^2), A017233 (9*n+6). %K A017234 nonn,easy %O A017234 0,1 %A A017234 _N. J. A. Sloane_