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 A348024 #12 Sep 26 2021 02:27:35
%S A348024 1,1,-13,-87,2609,34965,-1638841,-33411007,2128380881,58501278297,
%T A348024 -4709853961605,-163166745402375,15875893807564465,664163782026582877,
%U A348024 -75766955207796981345,-3716140360596415682175,486265092408065178623265,27363821966293458296896305,-4039473192629570940395992765
%N A348024 a(n) = [x^n] Product_{k=1..2*n} (x + (-1)^k * k).
%H A348024 Seiichi Manyama, <a href="/A348024/b348024.txt">Table of n, a(n) for n = 0..350</a>
%F A348024 a(n) = A047991(2*n,n).
%o A348024 (PARI) a(n) = polcoef(prod(k=1, 2*n, x+(-1)^k*k), n);
%Y A348024 Cf. A047991, A129505, A348023.
%K A348024 sign
%O A348024 0,3
%A A348024 _Seiichi Manyama_, Sep 25 2021