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 A056447 #6 Aug 22 2017 20:53:12 %S A056447 0,0,0,0,1,3,6,52,148,1139,2306,30118,48476,478951,1762916,8601578, %T A056447 20789656,268188491,431583572,4685757971,15045763306,86991020695, %U A056447 190548007556,2526401778030,4873374476387,39199367113661 %N A056447 Number of primitive (period n) step cyclic shifted sequence structures using exactly five different symbols. %C A056447 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 A056447 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 A056447 A056442(n)-A056441(n). %Y A056447 Cf. A056427. %K A056447 nonn %O A056447 1,6 %A A056447 _Marks R. Nester_