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