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 A365841 #10 Sep 20 2023 10:01:18
%S A365841 1,7,75,959,13512,202433,3164018,51010415,842090988,14163385916,
%T A365841 241843189651,4181341506009,73054000725300,1287786922627590,
%U A365841 22876030462690500,409093644922627407,7358978253387945404,133067774551068558740,2417375777620571832476
%N A365841 Expansion of (1/x) * Series_Reversion( x*(1-x)^5/(1+x)^2 ).
%F A365841 a(n) = (1/(n+1)) * Sum_{k=0..n} binomial(5*n+k+4,k) * binomial(2*(n+1),n-k).
%o A365841 (PARI) a(n) = sum(k=0, n, binomial(5*n+k+4, k)*binomial(2*(n+1), n-k))/(n+1);
%Y A365841 Cf. A032349, A365839, A365840.
%Y A365841 Cf. A365766.
%K A365841 nonn
%O A365841 0,2
%A A365841 _Seiichi Manyama_, Sep 20 2023