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 A296353 #16 May 13 2020 07:04:40
%S A296353 80,-1215,142805,-7004233215,870763219280,87789257318405,
%T A296353 45421053339522658203125,-7059547871395329316834815,
%U A296353 -19913109703689000789427796194815,42950557989828549673287680,940419421873808776346210289268985127605
%N A296353 List of nonzero determinants of Unbordered Lights Out matrices UBL_k.
%C A296353 For the orders of these matrices see A296352.
%H A296353 Amiram Eldar, <a href="/A296353/b296353.txt">Table of n, a(n) for n = 1..31</a>
%H A296353 Martin Kreh, <a href="https://doi.org/10.4169/amer.math.monthly.124.10.937">"Lights Out" and Variants</a>, Amer. Math. Month., Vol. 124 (10), Dec. 2017, pp. 937-950.
%t A296353 K[n_] := Table[If[MemberQ[{0, 1, n - 1}, Abs[i - j]], 1, 0], {i, 1, n}, {j, 1, n}]; UL[n_] := KroneckerProduct[(kn = K[n]), (in = IdentityMatrix[n])] + KroneckerProduct[in, kn] - IdentityMatrix[n^2]; Select[Table[Det @ UL[n], {n, 3, 20}], # != 0 &] (* _Amiram Eldar_, May 13 2020 *)
%Y A296353 Cf. A296350, A296351, A296352.
%K A296353 sign
%O A296353 1,1
%A A296353 _N. J. A. Sloane_, Dec 14 2017