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 A131575 #15 Jul 10 2018 13:42:52
%S A131575 1,1,0,2,0,4,0,8,0,16,0,32,0,64,0,128,0,256,0,512,0,1024,0,2048,0,
%T A131575 4096,0,8192,0,16384,0,32768,0,65536,0,131072,0,262144,0,524288,0,
%U A131575 1048576,0,2097152,0,4194304,0,8388608,0
%N A131575 First differences of A131572.
%H A131575 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (0, 2).
%F A131575 a(n) = A131572(n+1) - A131572(n).
%F A131575 a(n) = A077957(n-1), n>0.
%F A131575 G.f.: (1 + x - 2x^2)/(1-2x^2). - _Philippe Deléham_, Oct 01 2011
%t A131575 Differences[LinearRecurrence[{0,2},{0,1,2},50]] (* or *) LinearRecurrence[ {0, 2}, {1, 1, 0}, 50] (* or *) Join[{1},Riffle[2^Range[0,30],0]] (* _Harvey P. Dale_, Jul 10 2018 *)
%K A131575 nonn,easy
%O A131575 0,4
%A A131575 _Paul Curtz_, Aug 28 2007
%E A131575 Edited by _R. J. Mathar_, Jul 16 2008
%E A131575 More terms from _Philippe Deléham_, Oct 01 2011