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 A292854 #4 Sep 25 2017 13:08:30
%S A292854 1,-2,4,-6,8,-12,18,-24,32,-44,58,-76,100,-128,164,-210,264,-332,416,
%T A292854 -516,640,-790,968,-1184,1444,-1752,2120,-2560,3078,-3692,4420,-5272,
%U A292854 6276,-7456,8832,-10444,12326,-14512,17056,-20012,23432,-27392,31972,-37248,43332,-50338,58380,-67616,78208,-90328,104196
%N A292854 Expansion of 1/(1 + x + x/(1 + x^2 + x^2/(1 + x^3 + x^3/(1 + x^4 + x^4/(1 + ...))))), a continued fraction.
%t A292854 nmax = 50; CoefficientList[Series[1/(1 + x + ContinuedFractionK[x^k, 1 + x^(k + 1), {k, 1, nmax}]), {x, 0, nmax}], x]
%Y A292854 Cf. A088354.
%K A292854 sign
%O A292854 0,2
%A A292854 _Ilya Gutkovskiy_, Sep 25 2017