This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A180779 #5 Jun 02 2025 03:04:53
%S A180779 0,1,15,327,4856,53455,444003,2948305,16112289,75389116,307372600,
%T A180779 1122069080,3701885580,11258893954,31699979961,83910860201,
%U A180779 209004408715,496246703439,1121475446118,2440154664350,5096346969372,10323359668079
%N A180779 Number of distinct solutions of sum{i=1..8}(x(2i-1)*x(2i)) = 0 (mod n), with x() only in 1..n-1.
%C A180779 Column 8 of A180782
%H A180779 R. H. Hardin, <a href="/A180779/b180779.txt">Table of n, a(n) for n=1..183</a>
%e A180779 Solutions for sum of products of 8 1..2 pairs = 0 (mod 3) are
%e A180779 (1*1 + 1*1 + 1*1 + 1*1 + 1*1 + 1*1 + 1*1 + 1*2)
%e A180779 (1*1 + 1*1 + 1*1 + 1*1 + 1*1 + 1*1 + 1*2 + 2*2)
%e A180779 (1*1 + 1*1 + 1*1 + 1*1 + 1*2 + 1*2 + 1*2 + 1*2)
%e A180779 (1*1 + 1*1 + 1*1 + 1*1 + 1*1 + 1*2 + 2*2 + 2*2)
%e A180779 (1*1 + 1*1 + 1*1 + 1*1 + 1*2 + 2*2 + 2*2 + 2*2)
%e A180779 (1*1 + 1*1 + 1*1 + 1*2 + 1*2 + 1*2 + 1*2 + 2*2)
%e A180779 (1*1 + 1*1 + 1*1 + 1*2 + 2*2 + 2*2 + 2*2 + 2*2)
%e A180779 (1*1 + 1*1 + 1*2 + 1*2 + 1*2 + 1*2 + 2*2 + 2*2)
%e A180779 (1*1 + 1*1 + 1*2 + 2*2 + 2*2 + 2*2 + 2*2 + 2*2)
%e A180779 (1*1 + 1*2 + 1*2 + 1*2 + 1*2 + 1*2 + 1*2 + 1*2)
%e A180779 (1*1 + 1*2 + 1*2 + 1*2 + 1*2 + 2*2 + 2*2 + 2*2)
%e A180779 (1*1 + 1*2 + 2*2 + 2*2 + 2*2 + 2*2 + 2*2 + 2*2)
%e A180779 (1*2 + 1*2 + 1*2 + 1*2 + 1*2 + 1*2 + 1*2 + 2*2)
%e A180779 (1*2 + 1*2 + 1*2 + 1*2 + 2*2 + 2*2 + 2*2 + 2*2)
%e A180779 (1*2 + 2*2 + 2*2 + 2*2 + 2*2 + 2*2 + 2*2 + 2*2)
%K A180779 nonn
%O A180779 1,3
%A A180779 _R. H. Hardin_ Sep 20 2010