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 A334180 #15 Dec 20 2024 20:43:15
%S A334180 1,47,4271,434657,46069729,4974089647,541714928431,59235304882177,
%T A334180 6489376893239297,711542422708907311,78049793235712789423,
%U A334180 8562932336475599244257,939528644055272842890721,103089508033934831216777903,11311669427350891385087911471
%N A334180 Number of dimer tilings of a 2*n x 8 Moebius strip.
%F A334180 a(n)^2 = 4^n * Resultant(U_{2*n}(x/2), T_{8}(i*x/2)), where T_n(x) is a Chebyshev polynomial of the first kind, U_n(x) is a Chebyshev polynomial of the second kind and i = sqrt(-1).
%t A334180 a[n_] := 2^n * Sqrt[Resultant[ChebyshevU[2*n, x/2], ChebyshevT[8, I*x/2], x]]; Array[a, 15, 0] (* _Amiram Eldar_, May 04 2021 *)
%o A334180 (PARI) {a(n) = sqrtint(4^n*polresultant(polchebyshev(2*n, 2, x/2), polchebyshev(8, 1, I*x/2)))}
%Y A334180 Column 4 of A103997.
%Y A334180 Column 8 of A334178.
%K A334180 nonn
%O A334180 0,2
%A A334180 _Seiichi Manyama_, Apr 17 2020