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 A024069 #18 Sep 08 2022 08:44:48
%S A024069 1,5,-92,-1971,-15088,-70349,-233280,-543607,-417536,5294727,50466176,
%T A024069 343309885,2140950528,12997945499,78258750592,470014125201,
%U A024069 2820841472000,16926249106063,101559344448384,609358846138757
%N A024069 a(n) = 6^n - n^7.
%H A024069 Vincenzo Librandi, <a href="/A024069/b024069.txt">Table of n, a(n) for n = 0..500</a>
%F A024069 From _Chai Wah Wu_, Jan 26 2020: (Start)
%F A024069 a(n) = 14*a(n-1) - 76*a(n-2) + 224*a(n-3) - 406*a(n-4) + 476*a(n-5) - 364*a(n-6) + 176*a(n-7) - 49*a(n-8) + 6*a(n-9) for n > 8.
%F A024069 G.f.: (-7*x^8 - 711*x^7 - 7054*x^6 - 13249*x^5 - 4800*x^4 + 527*x^3 + 86*x^2 + 9*x - 1)/((x - 1)^8*(6*x - 1)). (End)
%t A024069 Table[6^n-n^7,{n,0,60}] (* _Vladimir Joseph Stephan Orlovsky_, Feb 15 2011 *)
%o A024069 (Magma) [6^n-n^7: n in [0..25]]; // _Vincenzo Librandi_, Jul 03 2011
%K A024069 sign,easy
%O A024069 0,2
%A A024069 _N. J. A. Sloane_