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 A248841 #6 Jul 23 2025 11:47:24 %S A248841 2,6,24,120,720,5040,40320,362878,3628706,39913932,478928016, %T A248841 6225275778,87138262602,1306763837486,20901947961712,355203011199460, %U A248841 6390875986594862,121365402664456728,2425912530967520904 %N A248841 Number of length n arrays x(i), i=1..n with x(i) in 0..i and no value appearing more than 7 times. %C A248841 Column 7 of A248842 %H A248841 R. H. Hardin, <a href="/A248841/b248841.txt">Table of n, a(n) for n = 1..95</a> %e A248841 Some solutions for n=6 %e A248841 ..1....0....1....1....0....1....1....0....1....1....1....0....0....1....0....0 %e A248841 ..0....2....2....2....1....1....1....2....0....1....0....1....0....1....2....0 %e A248841 ..1....2....3....3....0....3....1....2....2....3....1....3....0....2....3....0 %e A248841 ..2....3....3....4....0....0....0....3....0....2....3....1....3....3....2....3 %e A248841 ..0....1....1....0....4....1....4....2....3....4....1....2....0....3....1....5 %e A248841 ..1....5....2....3....3....6....6....5....0....4....0....2....0....2....6....0 %K A248841 nonn %O A248841 1,1 %A A248841 _R. H. Hardin_, Oct 15 2014