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 A291984 #10 Sep 09 2017 11:07:01 %S A291984 1,-1,0,-1,1,0,1,-1,1,-2,1,-1,2,-1,1,-2,2,-2,2,-2,2,-2,2,-2,3,-3,2,-3, %T A291984 3,-2,3,-3,3,-4,3,-3,4,-3,3,-4,4,-4,4,-4,4,-4,4,-4,5,-5,4,-5,5,-4,5, %U A291984 -5,5,-6,5,-5,6,-5,5,-6,6,-6,6,-6,6,-6,6,-6,7,-7,6,-7 %N A291984 Expansion of 1/((1+x)*(1+x^2)*(1+x^3)*(1+x^4)). %H A291984 <a href="/index/Rec#order_10">Index entries for linear recurrences with constant coefficients</a>, signature (-1, -1, -2, -2, -2, -2, -2, -1, -1, -1). %o A291984 (PARI) Vec(1/((1+x)*(1+x^2)*(1+x^3)*(1+x^4)) + O(x^100)) %Y A291984 Cf. A291954, A291983, A291985. %K A291984 sign %O A291984 0,10 %A A291984 _Seiichi Manyama_, Sep 07 2017