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A180799 Number of distinct solutions of sum{i=1..7}(x(2i-1)*x(2i)) = 0 (mod n), with x() in 0..n-1 1
1, 20, 270, 3000, 23282, 151473, 768541, 3422978, 12879078, 44111410, 133919379, 381516366, 988173838, 2446846672, 5633359713, 12527643860, 26226659375, 53655084387, 104124710377, 198817175068, 363133886202, 654527617329 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 7 of A180803

LINKS

R. H. Hardin, Table of n, a(n) for n=1..183

EXAMPLE

Solutions for sum of products of 7 0..1 pairs = 0 (mod 2) are

(0*0 + 0*0 + 0*0 + 0*0 + 0*0 + 0*0 + 0*0)

(0*0 + 0*0 + 0*0 + 0*0 + 0*0 + 0*0 + 0*1)

(0*0 + 0*0 + 0*0 + 0*0 + 0*0 + 0*1 + 0*1)

(0*0 + 0*0 + 0*0 + 0*0 + 0*1 + 0*1 + 0*1)

(0*0 + 0*0 + 0*0 + 0*0 + 0*0 + 1*1 + 1*1)

(0*0 + 0*0 + 0*0 + 0*0 + 0*1 + 1*1 + 1*1)

(0*0 + 0*0 + 0*0 + 0*1 + 0*1 + 0*1 + 0*1)

(0*0 + 0*0 + 0*0 + 0*1 + 0*1 + 1*1 + 1*1)

(0*0 + 0*0 + 0*0 + 1*1 + 1*1 + 1*1 + 1*1)

(0*0 + 0*0 + 0*1 + 0*1 + 0*1 + 0*1 + 0*1)

(0*0 + 0*0 + 0*1 + 0*1 + 0*1 + 1*1 + 1*1)

(0*0 + 0*0 + 0*1 + 1*1 + 1*1 + 1*1 + 1*1)

(0*0 + 0*1 + 0*1 + 0*1 + 0*1 + 0*1 + 0*1)

(0*0 + 0*1 + 0*1 + 0*1 + 0*1 + 1*1 + 1*1)

(0*0 + 0*1 + 0*1 + 1*1 + 1*1 + 1*1 + 1*1)

(0*0 + 1*1 + 1*1 + 1*1 + 1*1 + 1*1 + 1*1)

(0*1 + 0*1 + 0*1 + 0*1 + 0*1 + 0*1 + 0*1)

(0*1 + 0*1 + 0*1 + 0*1 + 0*1 + 1*1 + 1*1)

(0*1 + 0*1 + 0*1 + 1*1 + 1*1 + 1*1 + 1*1)

(0*1 + 1*1 + 1*1 + 1*1 + 1*1 + 1*1 + 1*1)

CROSSREFS

Sequence in context: A019928 A025934 A283517 * A021594 A224248 A019793

Adjacent sequences:  A180796 A180797 A180798 * A180800 A180801 A180802

KEYWORD

nonn

AUTHOR

R. H. Hardin, suggested by Max Alekseyev in the Sequence Fans Mailing List, Sep 20 2010

STATUS

approved

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Last modified April 23 02:15 EDT 2019. Contains 322380 sequences. (Running on oeis4.)