%I A056269
%S A056269 0,0,0,24,240,1560,8400,40800,186480,818280,3498000,14674440,60780720,
%T A056269 249393480,1016542560,4123132800,16664094960,67171179600,270232006800,
%U A056269 1085569963080,4356217672800,17466683473800
%N A056269 Number of primitive (aperiodic) words of length n which contain exactly 
               four different symbols.
%D A056269 M. R. Nester (1999). Mathematical investigations of some plant interaction 
               designs. PhD Thesis. University of Queensland, Brisbane, Australia.
%F A056269 sum mu(d)*A000919(n/d) where d|n.
%F A056269 Seems to be n * A056289.
%Y A056269 Cf. A000302, A000919, A054719.
%Y A056269 Sequence in context: A052663 A167548 A052796 this_sequence A000919 A014340 
               A052753
%Y A056269 Adjacent sequences: A056266 A056267 A056268 this_sequence A056270 A056271 
               A056272
%K A056269 nonn
%O A056269 1,4
%A A056269 Marks R. Nester (nesterm(AT)dpi.qld.gov.au)