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 A366359 #10 Oct 08 2023 10:50:21
%S A366359 1,2,-7,69,-715,8351,-103735,1346247,-18035023,247520970,-3462344959,
%T A366359 49181268701,-707502644111,10286493363184,-150913708053635,
%U A366359 2231345941617611,-33215679733509159,497392118745778015,-7487512016559918595,113242852989349372915
%N A366359 G.f. satisfies A(x) = 1/(1 - x) + x/A(x)^4.
%F A366359 a(n) = (-1)^(n-1) * Sum_{k=0..n} binomial(5*k-1,k) * binomial(5*k-1,n-k)/(5*k-1).
%o A366359 (PARI) a(n) = (-1)^(n-1)*sum(k=0, n, binomial(5*k-1, k)*binomial(5*k-1, n-k)/(5*k-1));
%Y A366359 Cf. A007317, A199475, A349289, A349290, A349291, A349292, A349293, A366356, A366357, A366358.
%Y A366359 Cf. A364408, A366328, A366366.
%K A366359 sign
%O A366359 0,2
%A A366359 _Seiichi Manyama_, Oct 08 2023