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 A024045 #12 Jul 08 2025 17:26:42 %S A024045 1,3,-496,-19619,-261888,-1952101,-10073600,-40337223,-134152192, %T A024045 -387158345,-998951424,-2353753387,-5143003136,-10537390509, %U A024045 -20392611328,-37369617551,-64424509440,-101408007313,-129639813632 %N A024045 a(n) = 4^n-n^9. %H A024045 Vincenzo Librandi, <a href="/A024045/b024045.txt">Table of n, a(n) for n = 0..500</a> %o A024045 (Magma) [4^n-n^9: n in [0..30]]; // _Vincenzo Librandi_, Jul 02 2011 %K A024045 sign,easy %O A024045 0,2 %A A024045 _N. J. A. Sloane_