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 A214941 #6 Jul 22 2025 23:20:41 %S A214941 7,42,252,1470,8610,50190,292740,1706250,9946020,57970080,337883700, %T A214941 1969343880,11478292770,66900843240,389929523550,2272690998690 %N A214941 Number of squarefree words of length n in a 7-ary alphabet. %C A214941 Column 6 of A214943 %e A214941 Some solutions for n=6 %e A214941 ..0....4....4....4....5....2....4....4....2....3....6....0....0....6....2....5 %e A214941 ..4....1....6....0....1....5....1....1....0....5....4....5....1....0....1....0 %e A214941 ..2....5....2....6....6....2....0....5....6....0....6....4....5....5....6....5 %e A214941 ..3....0....6....5....0....1....3....4....2....3....2....2....3....3....3....2 %e A214941 ..6....4....0....6....4....5....1....5....5....2....3....4....1....2....2....5 %e A214941 ..4....0....6....4....6....2....0....6....2....1....4....6....5....4....6....0 %K A214941 nonn %O A214941 1,1 %A A214941 _R. H. Hardin_ Jul 30 2012