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 A013810 #22 Apr 12 2023 14:53:51
%S A013810 19,2476099,322687697779,42052983462257059,5480386857784802185939,
%T A013810 714209495693373205673756419,93076495688256089536609610280499,
%U A013810 12129821994589221844500501021364910179,1580770532156861979997149793605296459437459
%N A013810 a(n) = 19^(4*n + 1).
%H A013810 Vincenzo Librandi, <a href="/A013810/b013810.txt">Table of n, a(n) for n = 0..100</a>
%H A013810 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a>
%H A013810 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (130321).
%F A013810 a(n) = 19^A016813(n) = A001029(A016813(n)). - _Wesley Ivan Hurt_, Jan 28 2014
%p A013810 A013810:=n->19^(4*n + 1); seq(A013810(n), n=0..15); # _Wesley Ivan Hurt_, Jan 28 2014
%t A013810 Table[19^(4n + 1), {n, 0, 15}] (* _Wesley Ivan Hurt_, Jan 28 2014 *)
%t A013810 NestList[130321#&,19,20] (* _Harvey P. Dale_, Apr 12 2023 *)
%o A013810 (Magma) [19^(4*n+1): n in [0..15]]; // _Vincenzo Librandi_, Jul 06 2011
%Y A013810 Cf. A001029, A016813.
%K A013810 nonn,easy
%O A013810 0,1
%A A013810 _N. J. A. Sloane_