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 A056389 #6 Aug 22 2017 20:53:10 %S A056389 0,0,0,0,30,900,2800,32010,139080,1276170,2960940,41625330,75086430, %T A056389 801519500,3162262140,16463761470,42395689530,579164323020, %U A056389 983928850100,11241276012750,37913042832500 %N A056389 Number of primitive (aperiodic) step shifted (decimated) sequences using exactly five different symbols. %C A056389 See A056371 for an explanation of step shifts. %D A056389 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 A056389 sum mu(d)*A056379(n/d) where d|n. %K A056389 nonn %O A056389 1,5 %A A056389 _Marks R. Nester_