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 A384983 #7 Jun 14 2025 10:35:59 %S A384983 1,1,7,76,1333,26816,596899,9687616,-295060055,-58508094464, %T A384983 -6236843712929,-591511769242624,-54886056134084963, %U A384983 -5038712914671656960,-452211859222540203653,-37655001036842279665664,-2423249878967831840406191,15689693768161840558505984,52587298505917986133331289655 %N A384983 E.g.f. A(x) satisfies A(x) = exp(x*A(x)/A(-x*A(x)^4)^2). %F A384983 See A384986. %o A384983 (PARI) a(n, k=-1) = if(n*k==0, 0^n, (-1)^n*k*sum(j=1, n, (-4*n+3*j+k)^(j-1)*binomial(n, j)*a(n-j, 2*j))); %Y A384983 Column k=1 of A384986. %K A384983 sign %O A384983 0,3 %A A384983 _Seiichi Manyama_, Jun 14 2025