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 A366088 #9 Sep 28 2023 12:07:45
%S A366088 1,1,2,5,13,35,96,264,719,1913,4875,11478,22860,26044,-77216,-793820,
%T A366088 -4394125,-20304455,-85805571,-343282020,-1321898694,-4943906064,
%U A366088 -18052305410,-64551823869,-226418611750,-779487689870,-2633172840764,-8717790419014
%N A366088 Expansion of (1/x) * Series_Reversion( x*(1-x)^2/(1-x-x^4) ).
%F A366088 a(n) = (1/(n+1)) * Sum_{k=0..floor(n/4)} (-1)^k * binomial(n+1,k) * binomial(2*n-3*k,n-4*k).
%o A366088 (PARI) a(n) = sum(k=0, n\4, (-1)^k*binomial(n+1, k)*binomial(2*n-3*k, n-4*k))/(n+1);
%Y A366088 Cf. A366086, A366087, A366089, A366090.
%Y A366088 Cf. A366054.
%K A366088 sign
%O A366088 0,3
%A A366088 _Seiichi Manyama_, Sep 28 2023