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 A056428 #9 Apr 25 2023 14:35:19
%S A056428 0,0,0,0,0,60,360,6030,35280,410976,1174896,19948140,43022700,
%T A056428 543757500,2524673904,15399112410,46338868800,737917430820,
%U A056428 1459120076400,19381180579776,75959665269480,534453891382764
%N A056428 Number of primitive (period n) step cyclic shifted sequences using exactly six different symbols.
%C A056428 See A056371 for an explanation of step shifts. Under step cyclic shifts, abcde, bdace, bcdea, cdeab and daceb etc. are equivalent.
%D A056428 M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia. [See A056391 for pdf file of Chap. 2]
%F A056428 a(n) = Sum_{d|n} mu(d)*A056419(n/d).
%Y A056428 Cf. A056419, A056423.
%K A056428 nonn
%O A056428 1,6
%A A056428 _Marks R. Nester_