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 A184234 #7 Jun 02 2025 03:26:28 %S A184234 1,1,2,1,5,5,41,36,199,420,1377,4140,10728,36839,87400,283225,660812, %T A184234 1940633,4609045,12276261,29878104,73822900,181872899,428160287, %U A184234 1053371836,2416581766,5864707345,13309989382,31614183273,71451195226 %N A184234 Number of strings of numbers x(i=1..n) in 0..3 with sum i^2*x(i)^2 equal to n^2*9. %C A184234 Column 3 of A184240 %H A184234 R. H. Hardin, <a href="/A184234/b184234.txt">Table of n, a(n) for n = 1..52</a> %e A184234 All solutions for n=5 %e A184234 ..3....0....2....0....3 %e A184234 ..3....0....2....0....2 %e A184234 ..2....0....2....3....2 %e A184234 ..3....0....3....3....2 %e A184234 ..0....3....1....0....2 %K A184234 nonn %O A184234 1,3 %A A184234 _R. H. Hardin_ Jan 10 2011