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A105750 RE(Product{k=0..n, 1+kI}), I=sqrt(-1). 1
1, 1, -1, -10, -10, 190, 730, -6620, -55900, 365300, 5864300, -28269800, -839594600, 2691559000, 159300557000, -238131478000, -38894192662000, -15194495654000, 11911522255750000, 29697351895900000, -4477959179352100000, -21683886333440500000, 2029107997508660900000 (list; graph; refs; listen; history; internal format)
OFFSET

0,4

FORMULA

a(n)=RE(Product{k=0..n, 1-kI}).

CROSSREFS

Cf. A009454, A003703, A105751.

Sequence in context: A145595 A047817 A065243 * A052983 A072804 A079793

Adjacent sequences:  A105747 A105748 A105749 * A105751 A105752 A105753

KEYWORD

easy,sign

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Apr 18 2005

EXTENSIONS

Corrected by N. J. A. Sloane (njas(AT)research.att.com), Nov 05 2005

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Last modified February 15 09:10 EST 2012. Contains 205747 sequences.