cp's OEIS Frontend

A215072 Number of squarefree words of length n in a 6-ary alphabet, with new values 0..5 introduced in increasing order.

%I A215072 #6 Mar 22 2023 14:39:51
%S A215072 1,1,2,4,12,40,153,638,2825,12938,60458,285664,1358283,6480694,
%T A215072 30979999,148249768,709832688,3399805736,16286469156,78026226228,
%U A215072 373832145200,1791120945112
%N A215072 Number of squarefree words of length n in a 6-ary alphabet, with new values 0..5 introduced in increasing order.
%C A215072 Column 5 of A215075.
%e A215072 Some solutions for n=9
%e A215072 ..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
%e A215072 ..1....1....1....1....1....1....1....1....1....1....1....1....1....1....1....1
%e A215072 ..2....2....2....2....2....2....2....2....2....2....0....2....0....2....2....2
%e A215072 ..3....1....0....3....0....3....3....0....3....0....2....0....2....3....0....3
%e A215072 ..4....3....3....0....3....4....2....3....1....3....1....3....1....4....3....4
%e A215072 ..3....2....0....2....2....5....0....0....2....0....3....4....2....2....4....2
%e A215072 ..5....4....2....4....3....3....2....4....4....2....0....3....0....3....1....0
%e A215072 ..0....3....4....3....4....4....1....3....5....4....1....2....1....0....0....2
%e A215072 ..3....4....2....5....3....1....4....5....4....0....3....0....0....2....2....3
%Y A215072 Cf. A215075.
%K A215072 nonn
%O A215072 1,3
%A A215072 _R. H. Hardin_, Aug 02 2012