A180806 Number of distinct solutions of sum{i=1..4}(x(2i-1)*x(2i)) = 1 (mod n), with x() in 0..n-1

0, 6, 42, 166, 612, 1649, 4501, 9772, 21631, 39911, 78602, 131634, 234593, 361145, 603810, 883492, 1396448, 1928226, 2949092, 3948312, 5771436, 7496953, 10742472, 13520820, 18931459, 23338564, 31813882, 38799595, 52158316, 61609006, 82337294

Offset

1,2

Comments

Column 4 of A180813

Links

R. H. Hardin, Table of n, a(n) for n=1..376

Example

Solutions for sum of products of 4 0..1 pairs = 1 (mod 2) are
(0*0 + 0*0 + 0*0 + 1*1) (0*0 + 0*0 + 0*1 + 1*1) (0*0 + 0*1 + 0*1 + 1*1)
(0*0 + 1*1 + 1*1 + 1*1) (0*1 + 0*1 + 0*1 + 1*1) (0*1 + 1*1 + 1*1 + 1*1)

Crossrefs

Sequence in context: A176780 A169938 A082986 * A253946 A359847 A062136

Adjacent sequences: A180803 A180804 A180805 * A180807 A180808 A180809

Keyword

nonn

Author

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

Status

approved