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 A291874 #14 Sep 06 2017 03:40:42 %S A291874 1,-1,0,0,-1,0,0,-1,0,-1,-1,0,-2,-1,-1,-3,-2,-3,-4,-4,-6,-7,-8,-11, %T A291874 -13,-16,-20,-24,-31,-37,-46,-58,-70,-88,-108,-133,-167,-204,-252, %U A291874 -315,-386,-479,-594,-731,-909,-1122,-1386,-1720,-2124,-2628,-3254,-4022,-4980 %N A291874 Expansion of 1 - x/(1 - x^3/(1 - x^5/(1 - x^7/(1 - x^9/(1 - ... - x^(2*k-1)/(1 - ...)))))), a continued fraction. %H A291874 Seiichi Manyama, <a href="/A291874/b291874.txt">Table of n, a(n) for n = 0..10000</a> %F A291874 Convolution inverse of A143951. %F A291874 a(n) = -A227310(n) for n > 0. %Y A291874 Cf. A049346, A143951, A227310, A291148 (similar sequence). %K A291874 sign %O A291874 0,13 %A A291874 _Seiichi Manyama_, Sep 04 2017