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 A336181 #18 Jul 11 2020 07:33:51
%S A336181 1,-1,-11,47,241,-2281,-3779,104831,-110207,-4415281,16955269,
%T A336181 161498831,-1252782959,-4376471737,73606867309,11876256767,
%U A336181 -3715460133887,9838677757343,160921055160469,-957644184613393,-5553047963695439,65231925087461879,102267746634093469
%N A336181 a(n) = Sum_{k=0..n} (-2)^k * binomial(n,k)^3.
%C A336181 Diagonal of the rational function 1 / (1 + y + z + x*y + y*z - 2*z*x - x*y*z).
%C A336181 Diagonal of the rational function 1 / ((1-x)*(1-y)*(1-z) + 2*x*y*z).
%t A336181 a[n_] := Sum[(-2)^k * Binomial[n, k]^3, {k, 0, n}]; Array[a, 23, 0] (* _Amiram Eldar_, Jul 11 2020 *)
%o A336181 (PARI) {a(n) = sum(k=0, n, (-2)^k*binomial(n, k)^3)}
%Y A336181 Column k=2 of A336179.
%Y A336181 Cf. A206178.
%K A336181 sign
%O A336181 0,3
%A A336181 _Seiichi Manyama_, Jul 10 2020