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 A056271 #6 Aug 22 2017 20:53:07 %S A056271 0,0,0,0,0,720,15120,191520,1905120,16435440,129230640,953028720, %T A056271 6711344640,45674173440,302899156560,1969146930240,12604139926560, %U A056271 79694818842240,499018753280880,3100376788241040 %N A056271 Number of primitive (aperiodic) words of length n which contain exactly six different symbols. %D A056271 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 A056271 Sum mu(d)*A000920(n/d) where d|n. %Y A056271 Cf. A000400, A000920, A054721. %K A056271 nonn %O A056271 1,6 %A A056271 _Marks R. Nester_