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 A288628 #10 Oct 16 2017 02:41:29 %S A288628 1,2,3,7,8,37,37,223,468,3203,6398,93103,178663,2282131,11561896, %T A288628 82120878,304719416,6316222138,17055376113,323332552319,1884432112761, %U A288628 20485110860448,87256977757852,2322728266726152,9277181270824996,159074512149044084,1122874592283076868 %N A288628 Number of step cyclic shifted sequence structures of length n using an infinite alphabet. %C A288628 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 A288628 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] %o A288628 (PARI) \\ see A056391 for Polya enumeration functions %o A288628 a(n) = NonequivalentStructs(CyclicStepShiftPerms(n), n); \\ _Andrew Howroyd_, Oct 14 2017 %Y A288628 Row sums of A288627. %Y A288628 Cf. A056391, A056371, A288621. %K A288628 nonn %O A288628 1,2 %A A288628 _Andrew Howroyd_, Jun 11 2017