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 A183880 #7 Jul 22 2025 09:16:15 %S A183880 4,89,1566,20527,183310,1347565,8984158,56952323,351661806,2141759809, %T A183880 12950960686,78020943223,469112191342,2817757426037,16916183927550, %U A183880 101527228990219,609257523135022,3655839340823305,21935955102434638 %N A183880 Number of arrangements of n+2 numbers in 0..5 with each number being the sum mod 6 of two others. %C A183880 Column 5 of A183884 %H A183880 R. H. Hardin, <a href="/A183880/b183880.txt">Table of n, a(n) for n = 1..122</a> %e A183880 Some solutions for n=2 %e A183880 ..2....0....3....1....1....0....5....2....3....2....1....2....4....4....2....3 %e A183880 ..4....4....4....5....5....4....1....5....0....4....5....2....1....5....3....1 %e A183880 ..2....2....1....3....4....2....3....3....3....4....2....0....3....1....1....5 %e A183880 ..0....4....5....2....3....2....2....1....0....0....3....4....5....3....5....4 %K A183880 nonn %O A183880 1,1 %A A183880 _R. H. Hardin_ Jan 07 2011