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A158496 Expansion of (1-4x+x^2)/(1+x^2)^2. +0
2
1, -4, -1, 8, 1, -12, -1, 16, 1, -20, -1, 24, 1, -28, -1, 32, 1, -36, -1, 40, 1, -44, -1, 48, 1, -52, -1, 56, 1, -60, -1, 64, 1, -68, -1, 72, 1, -76, -1, 80, 1, -84, -1, 88, 1, -92, -1, 96, 1, -100, -1, 104, 1, -108, -1, 112, 1, -116, -1, 120, 1, -124, -1, 128, 1, -132, -1 (list; graph; listen)
OFFSET

0,2

COMMENT

Hankel transform of A158495.

FORMULA

a(n)=((n+3/2-(n+1/2)*(-1)^n)*(-1)^C(n+1,2).

CROSSREFS

Cf. A019425.

Sequence in context: A085994 A040019 A019768 this_sequence A019425 A080102 A106475

Adjacent sequences: A158493 A158494 A158495 this_sequence A158497 A158498 A158499

KEYWORD

easy,sign

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Mar 20 2009

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Last modified December 4 08:07 EST 2009. Contains 170310 sequences.


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