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A160637 Hankel transform of A114464(n+1). 1
1, 1, -2, -8, -32, -128, 1024, 16384, 262144, 4194304, -134217728, -8589934592, -549755813888, -35184372088832, 4503599627370496, 1152921504606846976, 295147905179352825856, 75557863725914323419136 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Hankel transform of A114464(n) is A160636.

LINKS

Table of n, a(n) for n=0..17.

FORMULA

a(n)=(-2)^floor(C(n+1,2)/2).

CROSSREFS

Sequence in context: A081294 A004171 A009117 * A183895 A228921 A150829

Adjacent sequences:  A160634 A160635 A160636 * A160638 A160639 A160640

KEYWORD

easy,sign

AUTHOR

Paul Barry, May 21 2009

STATUS

approved

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Last modified November 23 17:23 EST 2014. Contains 249851 sequences.