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 A166734 #20 Jun 13 2022 08:02:15
%S A166734 0,-1,0,9,0,1476225,0,32724184981958652351324462890625,0
%N A166734 Determinant of the adjacency matrix of the n-cube graph Q_n.
%D A166734 N. Biggs, Algebraic Graph Theory, Cambridge Univ. Press 1974, p. 145.
%H A166734 Alois P. Heinz, <a href="/A166734/b166734.txt">Table of n, a(n) for n = 0..12</a>
%F A166734 a(n) = Product_{j=0..n} (n-2j)^binomial(n,j).
%e A166734 a(3) = (3^1)*(1^3)*((-1)^3)*((-3)^1) = 3*1*(-1)*(-3) = 9.
%p A166734 a:= n-> mul((n-2*j)^binomial(n, j), j=0..n):
%p A166734 seq(a(n), n=0..9); # _Alois P. Heinz_, Jun 12 2022
%o A166734 (PARI) a(n) = prod(j=0, n, (n-2*j)^binomial(n,j)); \\ _Michel Marcus_, Feb 08 2020
%Y A166734 Cf. A229333.
%K A166734 sign,easy
%O A166734 0,4
%A A166734 _Franz Vrabec_, Oct 20 2009