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 A290976 #13 Aug 18 2017 10:01:34 %S A290976 1,-1,0,0,-1,0,0,-1,0,0,-2,0,0,-3,0,0,-5,0,0,-8,-1,0,-13,-2,0,-21,-5, %T A290976 0,-34,-10,-1,-55,-20,-2,-89,-39,-6,-144,-73,-13,-234,-135,-29,-379, %U A290976 -245,-62,-617,-440,-126,-1003,-784,-253,-1636,-1383,-494,-2673,-2429,-952 %N A290976 Expansion of 1 - x/(1 - x^3/(1 - x^6/(1 - x^10/(1 - x^15/(1 - x^21/(1 - ... - x^(n*(n+1)/2)/(1 - ...))))))), a continued fraction. %F A290976 Convolution inverse of A206740. %e A290976 G.f. = 1 - x - x^4 - x^7 - 2*x^10 - 3*x^13 - 5*x^16 - 8*x^19 - ... %Y A290976 Cf. A206740. %K A290976 sign %O A290976 0,11 %A A290976 _Seiichi Manyama_, Aug 16 2017