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 A056277 #6 Aug 22 2017 20:53:07 %S A056277 1,1,4,13,51,197,875,4096,20643,109246,601491,3402911,19628063, %T A056277 114699438,676207572,4010086352,23874362199,142508702805,852124263683, %U A056277 5101098123207,30560194492576,183176169456214 %N A056277 Number of primitive (aperiodic) word structures of length n using a 6-ary alphabet. %C A056277 Permuting the alphabet will not change a word structure. Thus aabc and bbca have the same structure. %D A056277 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 A056277 sum mu(d)*A056273(n/d) where d|n and n>0. %Y A056277 Cf. A054721. %K A056277 nonn %O A056277 1,3 %A A056277 _Marks R. Nester_