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 A056382 #6 Aug 22 2017 20:53:10 %S A056382 3,6,15,45,69,381,387,1890,3393,14907,17799,139518,133101,798129, %T A056382 1804431,5452434,8072529,64596051,64573623,437717394,872156889, %U A056382 3138141621,4279259571,35361942282,42364514331 %N A056382 Number of primitive (aperiodic) step shifted (decimated) sequences using a maximum of three different symbols. %C A056382 See A056371 for an explanation of step shifts. %D A056382 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 A056382 Sum mu(d)*A056372(n/d) where d|n. %K A056382 nonn %O A056382 1,1 %A A056382 _Marks R. Nester_