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 A160674 #6 Mar 21 2017 08:42:22
%S A160674 1,63,305,847,1809,3311,5473,8415,12257,17119,23121,30383,39025,49167,
%T A160674 60929,74431,89793,107135,126577,148239,172241,198703,227745,259487,
%U A160674 294049,331551,372113,415855,462897,513359,567361,625023,686465,751807,821169,894671
%N A160674 A bisection of A063522.
%H A160674 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (4, -6, 4, -1).
%t A160674 Table[LegendreP[3,2n+1],{n,0,50}]
%o A160674 (PARI) a(n)=pollegendre(3,2*n+1) \\ _Charles R Greathouse IV_, Mar 19 2017
%K A160674 nonn,easy
%O A160674 0,2
%A A160674 _N. J. A. Sloane_, Nov 17 2009