A141125 - OEIS

%I #5 Feb 22 2013 21:28:52

%S 1,4,-4,-16,16,64,-64,-256,256,1024,-1024,-4096,4096,16384,-16384,

%T -65536,65536,262144,-262144,-1048576,1048576,4194304,-4194304,

%U -16777216,16777216,67108864,-67108864,-268435456,268435456

%N Hankel transform of a transform of Fibonacci numbers.

%C Hankel transform of A100095(n+1).

%F G.f.: (1+4x)/(1+4x^2); a(n)=2^n*(cos(pi*n/2)+2*sin(pi*n/2)).

%F a(n+3) = a(n+2)*a(n+1)/a(n). [_Reinhard Zumkeller_, Mar 04 2011]

%Y Cf. A141124.

%K easy,sign

%O 0,2

%A _Paul Barry_, Jun 05 2008