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 A056376 #7 Aug 22 2017 20:53:10 %S A056376 0,2,4,10,10,38,26,94,102,278,214,1246,702,2798,4342,8926,8230,44222, %T A056376 29202,136030,176750,419870,381490,2150398,1678254,5593998,7461166, %U A056376 22553406,19175158,134391038,71585134 %N A056376 Number of step shifted (decimated) sequences using exactly two different symbols. %C A056376 See A056371 for an explanation of step shifts. %D A056376 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 A056376 A056371(n)-2. %Y A056376 Cf. A056371. %K A056376 nonn %O A056376 1,2 %A A056376 _Marks R. Nester_