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A137718 A scaled Hankel transform. 1
1, -4, 2, 4, -8, 8, 8, -32, 16, 32, -64, 64, 64, -256, 128, 256, -512, 512, 512, -2048, 1024, 2048, -4096, 4096, 4096, -16384, 8192, 16384, -32768, 32768, 32768, -131072, 65536, 131072, -262144, 262144, 262144 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

A137717=2^floor(n/2)*a(n) is the Hankel transform of A106191.

LINKS

Table of n, a(n) for n=0..36.

FORMULA

a(n)=A137717(n)/2^floor(n/2).

Empirical g.f.: -(4*x^3-4*x^2+4*x-1) / (4*x^4+2*x^2+1). - Colin Barker, Jun 27 2013

CROSSREFS

Cf. A137719.

Sequence in context: A154973 A154793 A016693 * A007361 A128136 A048147

Adjacent sequences:  A137715 A137716 A137717 * A137719 A137720 A137721

KEYWORD

easy,sign

AUTHOR

Paul Barry, Feb 08 2008

STATUS

approved

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Last modified November 13 08:18 EST 2019. Contains 329093 sequences. (Running on oeis4.)