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 A384898 #11 Jun 12 2025 10:23:31 %S A384898 1,1,3,6,10,-39,-546,-3563,-18918,-68472,-47978,2060310,25856241, %T A384898 210422728,1367033271,6837535155,18339297562,-114989342976, %U A384898 -2525856651999,-27658429475813,-235591084478085,-1658029364805855,-9188248947018893,-28582654956147315,177119046663378954 %N A384898 G.f. A(x) satisfies A(x) = 1 + x/A(-x*A(x)^3)^3. %F A384898 See A384903. %o A384898 (PARI) a(n, k=-1) = if(n*k==0, 0^n, (-1)^n*k*sum(j=1, n, binomial(-3*n+4*j+k-1, j-1)*a(n-j, 3*j)/j)); %Y A384898 Column k=1 of A384903. %Y A384898 Cf. A001764, A213096, A384896, A384897. %K A384898 sign %O A384898 0,3 %A A384898 _Seiichi Manyama_, Jun 12 2025