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 A384943 #8 Jun 13 2025 08:21:01 %S A384943 1,1,6,-9,-244,-39,11262,36971,-268890,-3724293,-24899558,159971919, %T A384943 3851093928,9663394063,-197371002600,-2108992348026,-9447769941412, %U A384943 111942512192787,2253965670439788,7917705821761592,-100488750700889250,-1520857626228210483 %N A384943 G.f. A(x) satisfies A(x) = 1 + x/A(-x*A(x))^6. %F A384943 See A384946. %o A384943 (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, 6*j)/j)); %Y A384943 Column k=1 of A384946. %Y A384943 Cf. A002295, A213105. %Y A384943 Cf. A000012, A384894, A384896, A384941, A384942. %K A384943 sign %O A384943 0,3 %A A384943 _Seiichi Manyama_, Jun 13 2025