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 A056427 #6 Aug 22 2017 20:53:11 %S A056427 0,0,0,0,6,150,400,4080,15480,127812,269340,3493530,5777190,57262050, %T A056427 210945176,1030384035,2493913170,32176432430,51785999300,562228198086, %U A056427 1805427491520,10438821574410,22865672706000 %N A056427 Number of primitive (period n) step cyclic shifted sequences using exactly five different symbols. %C A056427 See A056371 for an explanation of step shifts. Under step cyclic shifts, abcde, bdace, bcdea, cdeab and daceb etc. are equivalent. %D A056427 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 A056427 sum mu(d)*A056418(n/d) where d|n. %Y A056427 Cf. A056422. %K A056427 nonn %O A056427 1,5 %A A056427 _Marks R. Nester_