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 A123276 #19 May 08 2025 02:22:55 %S A123276 1,8,131072,9444732965739290427392, %T A123276 994646472819573284310764496293641680200912301594695434880927953786318994025066751066112 %N A123276 Discriminant of the Chebyshev polynomial of first kind of degree 2^n. %C A123276 Next term is too large to include. %H A123276 Amiram Eldar, <a href="/A123276/b123276.txt">Table of n, a(n) for n = 0..5</a> %F A123276 a(n) = 2^(4^n+(n+1)*2^n-3*2^n+1). %t A123276 a[n_] := 2^(4^n + (n+1) * 2^n - 3 * 2^n+1); Array[a, 5, 0] (* _Amiram Eldar_, May 08 2025 *) %o A123276 (PARI) a(n)=2^(4^n+(n+1)*2^n-3*2^n+1); %o A123276 (PARI) a(n) = poldisc(polchebyshev(2^n, 1)); \\ _Michel Marcus_, Mar 02 2023 %Y A123276 Cf. A007701. %K A123276 nonn %O A123276 0,2 %A A123276 _Benoit Cloitre_, Oct 10 2006