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 A384617 #22 Jun 10 2025 13:57:25 %S A384617 1,1,5,13,-63,-2279,-51167,-423387,13717889,885044593,37051519041, %T A384617 779965433149,-14179999608959,-2798466635425239,-224720509492366495, %U A384617 -11148988922254048619,-300176114650473574143,18804123010954180467937,4351564646569010083711105 %N A384617 E.g.f. A(x) satisfies A(x) = exp( x/A(-x*A(x))^2 ). %F A384617 See A384808. %o A384617 (PARI) a(n, k=-1) = if(n*k==0, 0^n, (-1)^n*k*sum(j=1, n, (-n+j+k)^(j-1)*binomial(n, j)*a(n-j, 2*j))); %Y A384617 Column k=1 of A384808. %Y A384617 Cf. A052750, A213110, A213111, A384809, A384810. %Y A384617 Cf. A213108. %K A384617 sign %O A384617 0,3 %A A384617 _Seiichi Manyama_, Jun 10 2025