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 A070460 #16 Dec 18 2023 12:59:09
%S A070460 0,1,4,9,16,25,36,11,26,5,24,7,30,17,6,35,28,23,20,19,20,23,28,35,6,
%T A070460 17,30,7,24,5,26,11,36,25,16,9,4,1,0,1,4,9,16,25,36,11,26,5,24,7,30,
%U A070460 17,6,35,28,23,20,19,20,23,28,35,6,17,30,7,24,5,26,11,36,25,16,9,4,1,0,1,4
%N A070460 a(n) = n^2 mod 38.
%H A070460 G. C. Greubel, <a href="/A070460/b070460.txt">Table of n, a(n) for n = 0..1000</a>
%H A070460 <a href="/index/Rec#order_38">Index entries for linear recurrences with constant coefficients</a>, signature (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1).
%F A070460 a(n) = a(n-38). - _G. C. Greubel_, Mar 25 2016
%t A070460 Table[Mod[n^2,38],{n,0,200}] (* _Vladimir Joseph Stephan Orlovsky_, Apr 27 2011 *)
%t A070460 PowerMod[Range[0,80],2,38] (* _Harvey P. Dale_, Feb 10 2015 *)
%o A070460 (PARI) a(n)=n^2%38 \\ _Charles R Greathouse IV_, Apr 06 2016
%Y A070460 Cf. A070456, A070457.
%K A070460 nonn,easy
%O A070460 0,3
%A A070460 _N. J. A. Sloane_, May 12 2002