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 A184235 #7 Jun 02 2025 03:26:34 %S A184235 1,1,1,1,3,15,31,119,555,2138,9548,33391,136682,468971,1753525, %T A184235 5789709,19745186,63565260,203046061,638284176,1947963410,5979604119, %U A184235 17725544038,53252284414,155128241215,456635560332,1314718658955,3796821176997 %N A184235 Number of strings of numbers x(i=1..n) in 0..4 with sum i^2*x(i)^2 equal to n^2*16. %C A184235 Column 4 of A184240 %H A184235 R. H. Hardin, <a href="/A184235/b184235.txt">Table of n, a(n) for n = 1..39</a> %e A184235 All solutions for n=5 %e A184235 ..2....0....0 %e A184235 ..1....0....0 %e A184235 ..2....4....0 %e A184235 ..4....4....0 %e A184235 ..2....0....4 %K A184235 nonn %O A184235 1,5 %A A184235 _R. H. Hardin_ Jan 10 2011