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 A013770 #19 Sep 08 2022 08:44:38 %S A013770 22,234256,2494357888,26559922791424,282810057883082752, %T A013770 3011361496339065143296,32064977213018365645815808, %U A013770 341427877364219557396646723584,3635524038174209847159494312722432,38711059958478986452554295441868455936 %N A013770 a(n) = 22^(3*n + 1). %H A013770 Vincenzo Librandi, <a href="/A013770/b013770.txt">Table of n, a(n) for n = 0..200</a> %H A013770 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a> %H A013770 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (10648). %o A013770 (Magma) [22^(3*n+1): n in [0..10]]; // _Vincenzo Librandi_, Jun 27 2011 %o A013770 (PARI) a(n)=22^(3*n+1) \\ _Charles R Greathouse IV_, Jul 10 2016 %Y A013770 Subsequence of A009966. %K A013770 nonn,easy %O A013770 0,1 %A A013770 _N. J. A. Sloane_