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 A384856 #11 Jun 11 2025 10:11:34 %S A384856 1,1,7,28,-107,-11744,-519101,-12366080,-101065751,19899785728, %T A384856 2369020104991,160985802059776,8664193820140093,137309806362677248, %U A384856 -48557247646714851365,-9196626471351773732864,-1230646715294157585659951,-124354471985557029636669440,-8657982884640209349171498569 %N A384856 E.g.f. A(x) satisfies A(x) = exp( x/A(-x*A(x)^2)^3 ). %F A384856 See A384860. %o A384856 (PARI) a(n, k=-1) = if(n*k==0, 0^n, (-1)^n*k*sum(j=1, n, (-2*n+2*j+k)^(j-1)*binomial(n, j)*a(n-j, 3*j))); %Y A384856 Column k=1 of A384860. %Y A384856 Cf. A052752, A213112, A213113, A384855, A384857, A384858. %K A384856 sign %O A384856 0,3 %A A384856 _Seiichi Manyama_, Jun 10 2025