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A141125 Hankel transform of a transform of Fibonacci numbers. 2
1, 4, -4, -16, 16, 64, -64, -256, 256, 1024, -1024, -4096, 4096, 16384, -16384, -65536, 65536, 262144, -262144, -1048576, 1048576, 4194304, -4194304, -16777216, 16777216, 67108864, -67108864, -268435456, 268435456 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Hankel transform of A100095(n+1).

LINKS

Table of n, a(n) for n=0..28.

FORMULA

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

a(n+3) = a(n+2)*a(n+1)/a(n). [Reinhard Zumkeller, Mar 04 2011]

CROSSREFS

Cf. A141124.

Sequence in context: A303072 A231839 A056450 * A164111 A164906 A213173

Adjacent sequences:  A141122 A141123 A141124 * A141126 A141127 A141128

KEYWORD

easy,sign

AUTHOR

Paul Barry, Jun 05 2008

STATUS

approved

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Last modified June 20 10:13 EDT 2019. Contains 324234 sequences. (Running on oeis4.)