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 A183889 #7 Jul 22 2025 09:17:05 %S A183889 1,1,32821,542557,4978219,38280865,277198249,1964161189,13808869207, %T A183889 96809981737,678032111797,4747103957005,33231843226435, %U A183889 232627950507697,1628407600271233,11398881253796341,79792234154371567,558545790385795897 %N A183889 Number of arrangements of n+3 numbers in 0..6 with each number being the sum mod 7 of three others. %C A183889 Column 6 of A183892 %H A183889 R. H. Hardin, <a href="/A183889/b183889.txt">Table of n, a(n) for n = 1..37</a> %e A183889 Some solutions for n=3 %e A183889 ..5....3....6....1....6....5....2....2....2....3....5....0....3....6....2....5 %e A183889 ..0....5....3....0....5....6....1....4....0....4....4....4....2....5....1....0 %e A183889 ..1....5....5....1....0....5....3....6....4....0....5....0....2....6....0....5 %e A183889 ..3....1....2....4....6....3....6....2....6....5....0....6....5....0....2....5 %e A183889 ..0....0....0....0....3....0....5....1....1....5....0....2....0....2....6....4 %e A183889 ..2....1....1....2....4....3....4....1....4....1....4....3....1....3....4....1 %K A183889 nonn %O A183889 1,3 %A A183889 _R. H. Hardin_ Jan 07 2011