The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A180776 Number of distinct solutions of sum{i=1..5}(x(2i-1)*x(2i)) = 0 (mod n), with x() only in 1..n-1 1
 0, 0, 7, 62, 402, 1960, 7587, 25470, 73146, 193036, 455161, 1022770, 2098782, 4196208, 7797217, 14286908, 24527232, 42125055, 67955391, 110571248, 170260213, 264585538, 390623343, 588725404, 837466268, 1220597598, 1696535256 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Column 5 of A180782 LINKS R. H. Hardin, Table of n, a(n) for n=1..249 EXAMPLE Solutions for sum of products of 5 1..2 pairs = 0 (mod 3) are (1*1 + 1*1 + 1*1 + 1*1 + 1*2) (1*1 + 1*1 + 1*1 + 1*2 + 2*2) (1*1 + 1*1 + 1*2 + 2*2 + 2*2) (1*1 + 1*2 + 1*2 + 1*2 + 1*2) (1*1 + 1*2 + 2*2 + 2*2 + 2*2) (1*2 + 1*2 + 1*2 + 1*2 + 2*2) (1*2 + 2*2 + 2*2 + 2*2 + 2*2) CROSSREFS Sequence in context: A254121 A047685 A171078 * A024089 A327588 A287481 Adjacent sequences:  A180773 A180774 A180775 * A180777 A180778 A180779 KEYWORD nonn AUTHOR R. H. Hardin Sep 20 2010 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified January 18 04:26 EST 2022. Contains 350410 sequences. (Running on oeis4.)