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 A056422 #6 Aug 22 2017 20:53:11 %S A056422 5,10,30,105,196,1460,2010,13950,37050,246542,445510,5204180,7832180, %T A056422 72701620,254689426,1196199375,2805046960,35322773200,55770979190, %U A056422 596439488166,1892294576710,10837222569140 %N A056422 Number of primitive (period n) step cyclic shifted sequences using a maximum of five different symbols. %C A056422 See A056371 for an explanation of step shifts. Under step cyclic shifts, abcde, bdace, bcdea, cdeab and daceb etc. are equivalent. %D A056422 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 A056422 Sum mu(d)*A056413(n/d) where d|n. %K A056422 nonn %O A056422 1,1 %A A056422 _Marks R. Nester_