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 A290975 #15 Aug 18 2017 10:01:25 %S A290975 1,-1,0,0,0,-1,0,0,0,-1,0,0,0,-1,-1,0,0,-1,-2,0,0,-1,-3,-1,0,-1,-4,-3, %T A290975 0,-1,-6,-6,-1,-1,-8,-10,-4,-1,-10,-17,-10,-2,-12,-27,-20,-6,-15,-40, %U A290975 -38,-16,-19,-56,-68,-36,-27,-79,-114,-75,-45,-109,-180,-147,-84 %N A290975 Expansion of 1 - x/(1 - x^4/(1 - x^9/(1 - x^16/(1 - x^25/(1 - x^36/(1 - ... - x^(n^2)/(1 - ...))))))), a continued fraction. %F A290975 Convolution inverse of A206739. %e A290975 G.f. = 1 - x - x^5 - x^9 - x^13 - x^14 - x^17 - 2*x^18 - ... %Y A290975 Cf. A206739. %K A290975 sign %O A290975 0,19 %A A290975 _Seiichi Manyama_, Aug 16 2017