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 A384896 #9 Jun 12 2025 10:23:20 %S A384896 1,1,3,0,-23,-51,27,920,5469,4836,-84822,-515991,-1733406,2541688, %T A384896 64653336,324962160,800371560,-3164656113,-49575569463,-260541998755, %U A384896 -734864189592,1794936737274,39518722602456,260877913774320,1122691536976305,1485180173013631 %N A384896 G.f. A(x) satisfies A(x) = 1 + x/A(-x*A(x))^3. %F A384896 See A384901. %o A384896 (PARI) a(n, k=-1) = if(n*k==0, 0^n, (-1)^n*k*sum(j=1, n, binomial(-n+2*j+k-1, j-1)*a(n-j, 3*j)/j)); %Y A384896 Column k=1 of A384901. %Y A384896 Cf. A001764, A213096, A384897, A384898. %K A384896 sign %O A384896 0,3 %A A384896 _Seiichi Manyama_, Jun 12 2025