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 A056435 #9 Aug 22 2017 20:53:11 %S A056435 0,0,1,2,3,14,11,52,72,274,281,2155,1741,9650,20456,58071,79293, %T A056435 599452,566739,3668218,6931312,23776154,31008623,246109051,282422552, %U A056435 1357819070,2615067966,11358104142 %N A056435 Number of step cyclic shifted sequence structures using exactly three different symbols. %C A056435 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 A056435 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 A056435 A056430(n)-A056429(n). %Y A056435 Column 3 of A288627. %Y A056435 Cf. A056416. %K A056435 nonn %O A056435 1,4 %A A056435 _Marks R. Nester_