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 A056400 #10 Aug 22 2017 20:53:10 %S A056400 0,0,0,0,0,1,4,83,454,5761,17998,334797,777107,10574995,52611728, %T A056400 342199022,1094122103,18448004619,38504610244,538330833767, %U A056400 2215487105217,16330536710131,45407723468330 %N A056400 Number of step shifted (decimated) sequence structures using exactly six different symbols. %C A056400 See A056371 for an explanation of step shifts. Permuting the symbols will not change the structure. %D A056400 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 A056400 A056395(n)-A056394(n). %Y A056400 Column 6 of A288620. %Y A056400 Cf. A056380. %K A056400 nonn %O A056400 1,7 %A A056400 _Marks R. Nester_