%I A056446
%S A056446 0,0,0,1,1,11,13,82,162,929,1369,13718,16421,124689,355792,1356698,
%T A056446 2555043,25933641,32931815,283329802,720489742,3308253663,5763641923,
%U A056446 60874684720,93543112675,600086794431
%N A056446 Number of primitive (period n) step cyclic shifted sequence structures 
               using exactly four different symbols.
%C A056446 See A056371 for an explanation of step shifts. Under step cyclic shifts, 
               abcde, bdace, bcdea, cdeab and daceb etc. are equivalent. Permuting 
               the symbols will not change the structure.
%D A056446 M. R. Nester (1999). Mathematical investigations of some plant interaction 
               designs. PhD Thesis. University of Queensland, Brisbane, Australia.
%F A056446 A056441(n)-A056440(n).
%Y A056446 Cf. A056426.
%Y A056446 Sequence in context: A057189 A072580 A116436 this_sequence A023317 A056436 
               A089824
%Y A056446 Adjacent sequences: A056443 A056444 A056445 this_sequence A056447 A056448 
               A056449
%K A056446 nonn
%O A056446 1,6
%A A056446 Marks R. Nester (nesterm(AT)dpi.qld.gov.au)