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 A136324 #9 Sep 08 2022 08:45:32 %S A136324 0,1,1,2,5,6,21,22,85,86,341,342,1365,1366,5461,5462,21845,21846, %T A136324 87381,87382,349525,349526,1398101,1398102,5592405,5592406,22369621, %U A136324 22369622,89478485,89478486,357913941 %N A136324 Interleaving of A002450(n), A002450(n) + 1. %H A136324 Vincenzo Librandi, <a href="/A136324/b136324.txt">Table of n, a(n) for n = 0..1000</a> %F A136324 a(n) = 5*a(n-2) - 4*a(n-4). %F A136324 From Lambert Herrgesell (zero815(AT)googlemail.com), Apr 19 2008: (Start) %F A136324 a(n) = 1/6 - (1/2)*(-1)^n + (1/4)*2^n + (1/12)*(-2)^n; %F A136324 g.f.: (-3*x^3 + x^2 + x)/(4*x^4 - 5*x^2 + 1). (End) %o A136324 (Magma) [1/6 - (1/2)*(-1)^n + (1/4)*2^n + (1/12)*(-2)^n: n in [0..40]]; // _Vincenzo Librandi_, Aug 09 2011 %K A136324 nonn %O A136324 0,4 %A A136324 _Paul Curtz_, Mar 26 2008 %E A136324 More terms from Lambert Herrgesell (zero815(AT)googlemail.com), Apr 19 2008