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 A056394 #7 Aug 22 2017 20:53:10 %S A056394 1,2,4,11,18,116,157,1110,3076,21808,42335,528612,859502,8547036, %T A056394 31968397,159716545,398048506,5303680564,8835749347,99411986634, %U A056394 331215914028,1987084129352,4515860983385,62095481040014 %N A056394 Number of step shifted (decimated) sequence structures using a maximum of five different symbols. %C A056394 See A056371 for an explanation of step shifts. Permuting the symbols will not change the structure. %D A056394 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 A056394 Use de Bruijn's generalization of Polya's enumeration theorem as discussed in reference. %Y A056394 Cf. A056374. %K A056394 nonn %O A056394 1,2 %A A056394 _Marks R. Nester_