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 A056385 #6 Aug 22 2017 20:53:10 %S A056385 6,30,120,720,2010,23820,46950,434700,1683450,15126810,36284466, %T A056385 547180200,1088416050,13060942950,58782162480,352913410080, %U A056385 1057916846190,16926687985950,33853322280030 %N A056385 Number of primitive (aperiodic) step shifted (decimated) sequences using a maximum of six different symbols. %C A056385 See A056371 for an explanation of step shifts. %D A056385 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 A056385 sum mu(d)*A056375(n/d) where d|n. %K A056385 nonn %O A056385 1,1 %A A056385 _Marks R. Nester_