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 A360894 #10 Feb 25 2023 08:41:11
%S A360894 1,1,1,0,-2,-1,7,0,-44,69,276,-1471,675,20407,-90560,-20552,2141700,
%T A360894 -10558223,-675239,329376824,-2106253225,2364924062,67114942438,
%U A360894 -621638176430,1926931098484,14768396756732,-236623058229675,1371752460097440,1098671590491324
%N A360894 G.f. satisfies A(x) = 1 + x * A(x * (1 - x)).
%F A360894 a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/2)} (-1)^k * binomial(n-1-k,k) * a(n-1-k).
%o A360894 (PARI) a_vector(n) = my(v=vector(n+1)); v[1]=1; for(i=1, n, v[i+1]=sum(j=0, (i-1)\2, (-1)^j*binomial(i-1-j, j)*v[i-j])); v;
%Y A360894 Cf. A360896, A360897.
%Y A360894 Cf. A127782.
%K A360894 sign
%O A360894 0,5
%A A360894 _Seiichi Manyama_, Feb 25 2023