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 A056390 #6 Aug 22 2017 20:53:10 %S A056390 0,0,0,0,0,360,2520,48060,317520,4109040,12923136,238784940,559279980, %T A056390 7612394400,37864711260,246262998780,787758864480,13282478024760, %U A056390 27723264985920,387585094204260,1595144664454200 %N A056390 Number of primitive (aperiodic) step shifted (decimated) sequences using exactly six different symbols. %C A056390 See A056371 for an explanation of step shifts. %D A056390 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 A056390 Sum mu(d)*A056380(n/d) where d|n. %K A056390 nonn %O A056390 1,6 %A A056390 _Marks R. Nester_