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 A097167 #5 Jun 13 2015 00:51:29 %S A097167 1,12,138,1542,16878,181902,1937118,20434062,213906558,2225159022, %T A097167 23026431198,237237880782,2435140927038,24916268343342, %U A097167 254246415090078,2588217735810702,26293959622296318,266645636600666862 %N A097167 3*10^n-2*9^n. %C A097167 Partial sums are A097168. %H A097167 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (19,-90). %F A097167 G.f. : (1-7x)/((1-9x)(1-10x)); a(n)=19a(n-1)-90a(n-2). %K A097167 easy,nonn %O A097167 0,2 %A A097167 _Paul Barry_, Jul 30 2004