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 A024056 #14 Sep 08 2022 08:44:48 %S A024056 1,4,-103,-2062,-15759,-75000,-264311,-745418,-1706527,-2829844, %T A024056 -234375,29340954,208308817,1157954608,5998102121,30346718750, %U A024056 152319455169,762529114452,3814085045593,19072592456386 %N A024056 a(n) = 5^n - n^7. %H A024056 Vincenzo Librandi, <a href="/A024056/b024056.txt">Table of n, a(n) for n = 0..500</a> %F A024056 From _Chai Wah Wu_, Jan 26 2020: (Start) %F A024056 a(n) = 13*a(n-1) - 68*a(n-2) + 196*a(n-3) - 350*a(n-4) + 406*a(n-5) - 308*a(n-6) + 148*a(n-7) - 41*a(n-8) + 5*a(n-9) for n > 8. %F A024056 G.f.: (-6*x^8 - 591*x^7 - 5863*x^6 - 10833*x^5 - 3609*x^4 + 647*x^3 + 87*x^2 + 9*x - 1)/((x - 1)^8*(5*x - 1)). (End) %o A024056 (Magma) [5^n-n^7: n in [0..30]]; // _Vincenzo Librandi_, Jul 03 2011 %K A024056 sign,easy %O A024056 0,2 %A A024056 _N. J. A. Sloane_