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 A384749 #8 Jun 09 2025 10:33:58 %S A384749 1,1,5,73,1881,73281,3919453,271474953,23404227185,2440865803969, %T A384749 301418221716981,43342981732882569,7161103011598307401, %U A384749 1344575638159799606913,284279495938201825060301,67153086545904981925170121,17604147845521944687437836257,5091302668361626521610878847617 %N A384749 E.g.f. A(x) satisfies A(x) = exp( x * A(x*A(x)^2)^2 ). %F A384749 See A384751. %o A384749 (PARI) a(n, k=1) = if(k==0, 0^n, k*sum(j=0, n, (2*n-2*j+k)^(j-1)*binomial(n, j)*a(n-j, 2*j))); %Y A384749 Column k=1 of A384751. %Y A384749 Cf. A384739. %K A384749 nonn %O A384749 0,3 %A A384749 _Seiichi Manyama_, Jun 09 2025