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 A056437 #9 Aug 22 2017 20:53:11 %S A056437 0,0,0,0,1,3,6,52,148,1140,2306,30121,48476,478957,1762917,8601630, %T A056437 20789656,268188642,431583572,4685759111,15045763312,86991023001, %U A056437 190548007556,2526401808203,4873374476388,39199367162137 %N A056437 Number of step cyclic shifted sequence structures using exactly five different symbols. %C A056437 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 A056437 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 A056437 A056432(n)-A056431(n). %Y A056437 Column 5 of A288627. %Y A056437 Cf. A056418. %K A056437 nonn %O A056437 1,6 %A A056437 _Marks R. Nester_