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 A147996 #11 Dec 28 2023 20:14:39
%S A147996 -7,-27,-123,-567,-2211,-2727,84477,1485513,18362109,200535993,
%T A147996 2059226877,20397799593,197430536829,1880870895513,17715781956477,
%U A147996 165457407809673,1535334245693949,14175044463955833,130346379428513277
%N A147996 a(n) = 9^n-8^n-7^n-6^n-5^n-4^n-3^n-2^n-1.
%H A147996 <a href="/index/Rec#order_09">Index entries for linear recurrences with constant coefficients</a>, signature (45,-870,9450,-63273,269325,-723680,1172700,-1026576,362880).
%F A147996 G.f.: x*(945936*x^8-2126232*x^7+1934792*x^6-942732*x^5+271467*x^4-47628*x^3+4998*x^2-288*x+7)/((x-1)*(2*x-1)*(3*x-1)*(4*x-1)*(5*x-1)*(6*x-1)*(7*x-1)*(8*x-1)*(9*x-1)). - _Colin Barker_, Oct 29 2012
%t A147996 lst={};Do[p=9^n-8^n-7^n-6^n-5^n-4^n-3^n-2^n-1^n;AppendTo[lst,p],{n,0,5!}];lst
%Y A147996 Cf. A147975-A147979.
%K A147996 sign,easy
%O A147996 1,1
%A A147996 _Vladimir Joseph Stephan Orlovsky_, Nov 19 2008