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 A292831 #9 Sep 25 2017 13:05:22 %S A292831 1,-2,-2,-6,-26,-134,-778,-4950,-33946,-248230,-1921130,-15650358, %T A292831 -133644026,-1192354310,-11084816458,-107138260758,-1074526263898, %U A292831 -11163814083430,-119971275641642,-1331739929195766,-15250978417105082,-179975143242023366 %N A292831 Expansion of 1 - 2*x - 2*x^2/(1 - 3*x - 4*x^2/(1 - 4*x - 6*x^2/(1 - 5*x - 8*x^2/(1 - 6*x - 10*x^2/(...))))), a continued fraction. %F A292831 Convolution inverse of A001861. %e A292831 G.f. = 1 - 2*x - 2*x^2 - 6*x^3 - 26*x^4 - 134*x^5 - 778*x^6 - 4950*x^7 - 33946*x^8 - ... %Y A292831 Cf. A001861. %K A292831 sign %O A292831 0,2 %A A292831 _Seiichi Manyama_, Sep 24 2017