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 A056433 #6 Aug 22 2017 20:53:11 %S A056433 1,2,3,7,8,37,36,219,452,3000,5652,74961,126758,1371016,5653854, %T A056433 31440841,87796362,1319722484,2491714134,31893717065,121274777228, %U A056433 832622962686,2170594048582,34308978981089 %N A056433 Step cyclic shifted sequence structures using a maximum of six different symbols. %C A056433 See A056371 for an explanation of step shifts. Under step cyclic shifts, abcde, bdace, bcdea, cdeab and daceb etc. are equivalent. Permuting the symbols will not change the structure. %D A056433 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 A056433 Use de Bruijn's generalization of Polya's enumeration theorem as discussed in reference. %Y A056433 Cf. A056414. %K A056433 nonn %O A056433 1,2 %A A056433 _Marks R. Nester_