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 A180781 #5 Jun 02 2025 03:05:05
%S A180781 0,1,18,756,18478,327338,4292145,43576141,354466005,2394458182,
%T A180781 13770292261,69111228938,307750080438,1236998118274,4537247867399,
%U A180781 15375840213938,48489022864504,143625325278096,401488209736317
%N A180781 Number of distinct solutions of sum{i=1..10}(x(2i-1)*x(2i)) = 0 (mod n), with x() only in 1..n-1.
%C A180781 Column 10 of A180782
%H A180781 R. H. Hardin, <a href="/A180781/b180781.txt">Table of n, a(n) for n=1..183</a>
%K A180781 nonn
%O A180781 1,3
%A A180781 _R. H. Hardin_ Sep 20 2010