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 A163206 #9 Sep 08 2022 08:45:46 %S A163206 1,10,108,1240,14864,183200,2296512,29075840,370237696,4729776640, %T A163206 60533664768,775533844480,9941579730944,127482480926720, %U A163206 1635024283287552,20972097420492800,269019714347401216,3450961324262686720,44269412765292822528,567899813473689272320 %N A163206 a(n) = 20*a(n-1) - 92*a(n-2) for n > 1; a(0) = 1, a(1) = 10. %C A163206 Binomial transform of A152267. Tenth binomial transform of powers of 8 interleaved with zeros. %H A163206 G. C. Greubel, <a href="/A163206/b163206.txt">Table of n, a(n) for n = 0..900</a> %H A163206 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (20,-92). %F A163206 a(n) = ((10+sqrt(8))^n + (10-sqrt(8))^n)/2. %F A163206 G.f.: (1-10*x)/(1-20*x+92*x^2). %t A163206 LinearRecurrence[{20, -92}, {1, 10}, 50] (* or *) Table[((10+Sqrt[8])^n + (10-Sqrt[8])^n)/2,{n,0,25}] (* _G. C. Greubel_, Dec 10 2016 *) %o A163206 (Magma) [ n le 2 select 9*n-8 else 20*Self(n-1)-92*Self(n-2): n in [1..17] ]; %o A163206 (PARI) Vec((1-10*x)/(1-20*x+92*x^2) + O(x^50)) \\ _G. C. Greubel_, Dec 10 2016 %Y A163206 Cf. A152267, A001018 (powers of 8). %K A163206 nonn,easy %O A163206 0,2 %A A163206 _Klaus Brockhaus_, Jul 28 2009 %E A163206 Terms a(18) - a(20) added by _G. C. Greubel_, Dec 10 2016