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 A094360 #7 May 22 2020 17:56:05
%S A094360 1,2,7,5,31,17,127,65,511,257,2047,1025,8191,4097,32767,16385,131071,
%T A094360 65537,524287,262145,2097151,1048577,8388607,4194305,33554431,
%U A094360 16777217,134217727,67108865,536870911,268435457,2147483647,1073741825
%N A094360 Pair reversal of Jacobsthal-Lucas numbers.
%C A094360 Pair reversal of A014551
%H A094360 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (-1,4,4).
%F A094360 G.f. : (1+3x+5x^2)/((1+x)(1-4x^2)); a(n)=2^n(5+3(-1)^n)/4-(-1)^n.
%t A094360 LinearRecurrence[{-1,4,4},{1,2,7},40] (* _Harvey P. Dale_, May 22 2020 *)
%Y A094360 Cf. A084183, A094359.
%K A094360 easy,nonn
%O A094360 0,2
%A A094360 _Paul Barry_, Apr 26 2004