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 A184698 #7 Jun 02 2025 03:50:38 %S A184698 1,3,9,28,78,207,504,1169,2574,5439,11071,21841,41846,78193,142787, %T A184698 255441,448444,773966,1314861,2201731,3637642,5935817,9574284, %U A184698 15277075,24130784,37755124,58545388,90021407,137320211,207895383,312495662 %N A184698 Number of strings of numbers x(i=1..n) in 0..4 with sum i*x(i) equal to n*4. %C A184698 Column 4 of A184703 %H A184698 R. H. Hardin, <a href="/A184698/b184698.txt">Table of n, a(n) for n = 1..170</a> %e A184698 Some solutions for n=6 %e A184698 ..2....3....3....3....1....3....4....2....2....0....2....3....3....4....1....1 %e A184698 ..4....1....3....0....0....2....0....0....3....0....1....0....2....2....4....3 %e A184698 ..2....3....2....0....3....4....0....4....0....0....1....3....1....0....0....2 %e A184698 ..2....1....1....4....1....0....0....1....0....3....0....0....1....0....1....0 %e A184698 ..0....0....1....1....2....1....4....0....2....0....1....0....2....2....1....1 %e A184698 ..0....1....0....0....0....0....0....1....1....2....2....2....0....1....1....1 %K A184698 nonn %O A184698 1,2 %A A184698 _R. H. Hardin_ Jan 20 2011